TU BSc CSIT entrance BSc. CSIT Entrance: Chemistry: Atomic Structure and Periodic Table

Most repeated · 5 of 13 exams
2069 · Entrance Examination 2069 · 1 mark

The unit of rate constant for first order reaction is (a) $sec^{-1}$ (b) $mol\ sec^{-1}$ (c) $mol\ sec^{-1}$ (d) $litre\ mol^{-2} s^{-1}$

Answer

(a) $sec^{-1}$

For a first-order reaction, rate $= k[A]$ , so

$k = \frac{\text{rate}}{[A]} = \frac{mol\ L^{-1}s^{-1}}{mol\ L^{-1}} = s^{-1}$

The unit of $k$ for order $n$ is $mol^{1-n}L^{n-1}s^{-1}$ , which gives $s^{-1}$ when $n = 1$ .

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Most repeated · 5 of 13 exams
2074 · 1 mark

The unit of rate constant for first order reaction is (a) $mol\ s^{-1}$ (b) $L\ mol^{-2}s^{-1}$ (c) $s^{-1}$ (d) $mol\ L^{-1}s^{-1}$

Similar questions: The unit of rate constant for first (2069 · Entrance Examination 2069) · The unit of rate constant for first order reaction is (2075) · The unit of first order rate constant is (2081)

Answer

(c) $s^{-1}$

For first order, rate $=k[A]$ , so $k=\text{rate}/[A]=(\text{mol L}^{-1}\text{s}^{-1})/(\text{mol L}^{-1})=\text{s}^{-1}$ .

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Most repeated · 5 of 13 exams
2075 · 1 mark

The unit of rate constant for first order reaction is (a) $Sec^{-1}$ (b) $mol\ Sec^{-1}$ (c) $mol^{-1}\ Sec^{-1}$ (d) $liter^2\ mol^{-2}\ S^{-1}$

Similar questions: The unit of rate constant for first (2069 · Entrance Examination 2069) · The unit of rate constant for first order reaction is (2074) · The unit of first order rate constant is (2081)

Answer

(a) $Sec^{-1}$ For a first order reaction, rate $=k[A]$ , so $k = \text{rate}/\text{conc} = (mol\,L^{-1}s^{-1})/(mol\,L^{-1}) = s^{-1}$ .

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Most repeated · 4 of 13 exams
2073 · 1 mark

The unit of rate constant for third order reaction is (a) $S^{-1}$ (b) $mol^{-2}L^2S^{-1}$ (c) $mol^{-1}LS^{-1}$ (d) $mol\ L^{-1}S^{-1}$

Similar questions: The unit of rate constant for first (2069 · Entrance Examination 2069) · The unit of rate constant for first order reaction is (2074) · The unit of rate constant for first order reaction is (2075)

Answer

(b) $mol^{-2}L^2S^{-1}$

For order $n$ , the unit of $k$ is $(mol\,L^{-1})^{1-n}\,s^{-1}$ . For $n=3$ this is $mol^{-2}L^2s^{-1}$ .

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Most repeated · 4 of 13 exams
2081 · 1 mark

The unit of first order rate constant is (a) $time^{-1}conc^{-1}$ (b) $time\ conc^{-1}$ (c) $conc.time^{-1}$ (d) $time^{-1}$

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Answer

(d) $time^{-1}$

For first order, $k = \frac{2.303}{t}\log\frac{a}{a-x}$ , which has the unit of $1/t$ (e.g. $s^{-1}$ ).

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Most repeated · 3 of 13 exams
2070 · 1 mark

$Na_2O$ is a (a) Neutral oxide (b) acidic oxide (c) Basic oxide (d) amphoteric oxide

Similar questions: MgO is an example of (2074) · PbO is an example of (2081)

Answer

(c) Basic oxide

Oxides of strongly electropositive metals are basic. $Na_2O$ reacts with water to give NaOH.

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Most repeated · 3 of 13 exams
2074 · 1 mark

Which of the following elements has highest electron affinity? (a) chlorine (b) bromine (c) iodine (d) fluorine

Answer

(a) chlorine

Chlorine has the highest electron affinity (about $-349$ kJ/mol). Fluorine is lower because its small size causes strong electron-electron repulsion.

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Most repeated · 3 of 13 exams
2074 · 1 mark

MgO is an example of (a) basic oxide (b) amphoteric oxide (c) neutral oxide (d) acidic oxide

Similar questions: Na 2O is a (2070) · PbO is an example of (2081)

Answer

(a) basic oxide

MgO is the oxide of a metal and reacts with acids to form salts and water, and with water to form $Mg(OH)_2$ .

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Most repeated · 3 of 13 exams
2081 · 1 mark

PbO is an example of (a) amphoteric oxide (b) neutral Oxide (c) acidic Oxide (d) basic Oxide

Similar questions: Na 2O is a (2070) · MgO is an example of (2074)

Answer

(a) amphoteric oxide

PbO reacts with both acids (forming Pb(II) salts) and strong bases (forming plumbites), so it is amphoteric.

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2069 · Entrance Examination 2069 · 1 mark

The weight of sodium carbonate required to prepare 100 mL of Deci normal sodium carbonate solution is (a) 0.53 gm (b) 5.3 gm (c) 0.353 gm (d) 5.6 gm

Answer

(a) 0.53 gm

For deci-normal solution, normality = 0.1 N.
Equivalent weight of Na₂CO₃ = 106/2 = 53 g/eq.
Mass required for 100 mL = 0.1 × 0.1 × 53 = 0.53 g.

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2069 · Entrance Examination 2069 · 1 mark

The actual electronic configuration of copper is (a) $[Ar]4s^2 3d^8$ (b) $[Ar]4s^1 3d^{10}$ (c) $[Ar]4s^2 3d^{10}$ (d) $[Ar]4s^2 3d^8$

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Answer

(b) $[Ar]4s^1 3d^{10}$

Copper ( $Z = 29$ ) has the expected Aufbau configuration $[Ar]4s^2 3d^9$ , but the actual configuration is $[Ar]4s^1 3d^{10}$ . The fully filled $3d$ subshell has extra stability (greater exchange energy and symmetry), so one $4s$ electron shifts to $3d$ . Hence option (b) is correct.

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2070 · 1 mark

Which of the following compounds has highest boiling point? (a) $CH_4$ (b) $CH_3Cl$ (c) $CH_3Br$ (d) $CH_3OH$

Similar questions: Which of the following acid has highest boiling point? (2081)

Answer

(d) $CH_3OH$

Methanol has intermolecular hydrogen bonding, which gives it a much higher boiling point (65 °C) than $CH_3Br$ (4 °C), $CH_3Cl$ (-24 °C) and $CH_4$ .

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2070 · 1 mark

Hematite is an ore of (a) Silver (b) Iron (c) Mercury (d) Copper

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Answer

(b) Iron

Hematite is $Fe_2O_3$ , an important ore of iron.

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2070 · 1 mark

Which of the following elements has highest electronegativity? (a) Bromine (b) Iodine (c) Chlorine (d) Fluorine

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Answer

(d) Fluorine

Electronegativity increases across a period and decreases down a group. Fluorine is the most electronegative element (4.0 on the Pauling scale).

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2070 · 1 mark

The rate of reaction is independent of (a) Temperature (b) concentration (c) Particle size of reactant (d) Molecularity

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Answer

(d) Molecularity

Rate depends on temperature, concentration and surface area (particle size) of the reactant. Molecularity is a theoretical count of molecules in the elementary step and does not affect the rate.

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2071 · 1 mark

The number of moles of water present in 18g of water is (a) 18 (b) 1 (c) 1.8 (d) 180

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Answer

(b) 1

Molar mass of water is 18 g/mol, so $n=\frac{18}{18}=1$ mol.

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2071 · 1 mark

In which of the following compound the molecular geometry cannot be predicted by the use of VSEPR theory? (a) $C_2H_6$ (b) $H_2O$ (c) $CH_4$ (d) $NH_3$

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Answer

(a) $C_2H_6$

VSEPR applies to molecules with a single central atom. $C_2H_6$ has two carbon centres, so its geometry cannot be predicted as a whole by VSEPR; $H_2O$ , $CH_4$ and $NH_3$ have one central atom each.

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2071 · 1 mark

Ammonia is manufactured by the use of (a) Solvay's process (b) Haber's process (c) Ostwald's process (d) Down's process

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Answer

(b) Haber's process

$N_2 + 3H_2 \rightleftharpoons 2NH_3$ using an iron catalyst at about 450 to 500 °C and 200 atm. Solvay makes $Na_2CO_3$ , Ostwald makes $HNO_3$ , and Down's cell makes Na.

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2071 · 1 mark

Penicillin is an example of (a) Antiseptic drug (b) Antipyretic drug (c) Antibiotic drug (d) Analgesic drug

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Answer

(c) Antibiotic drug

Penicillin is produced by the mould Penicillium and kills or inhibits bacteria.

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2072 · 1 mark

The number of moles present in 90 g of water is (a) 1.0 (b) 90.0 (c) 5.0 (d) 9.0

Similar questions: The number of moles of water present in 18g of water is (2071)

Answer

(c) 5.0

Molar mass of water is 18 g/mol, so moles $=90/18=5$ .

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2072 · 1 mark

The molecular geometry of which compound cannot be predicted by the application of VSEPR theory? (a) $CH_4$ (b) $PCl_5$ (c) $SF_6$ (d) $MgCl_2$

Similar questions: In which of the following compound the molecular geometry... (2071)

Answer

(d) $MgCl_2$

$MgCl_2$ is an ionic compound with a lattice structure, so VSEPR theory (for covalent molecules) does not apply. $CH_4$ , $PCl_5$ and $SF_6$ are covalent.

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2072 · 1 mark

Ammonia is manufactured by the use of (a) Down's Process (b) Solvay's Process (c) Haber's Process (d) Ostwald's Process

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Answer

(c) Haber's Process

$N_2+3H_2\rightleftharpoons2NH_3$ using an iron catalyst at about 200 atm and 450 to 500 $^\circ$ C.

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2072 · 1 mark

Dettol is an example of (a) analgesic drug (b) antipyretic drug (c) antibiotic drug (d) antiseptic drug

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Answer

(d) antiseptic drug

Dettol (chloroxylenol) is applied to living tissue to kill or stop the growth of microbes.

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2073 · 1 mark

Which of the following halogens has highest electron affinity? (a) fluorine (b) iodine (c) bromine (d) chlorine

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Answer

(d) chlorine

Chlorine has the highest electron affinity among the halogens; fluorine's is lower because of strong electron repulsion in its small 2p subshell.

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2074 · 1 mark

Each carbon atom in benzene is (a) $sp^2$ hybridized (b) $sp$ hybridized (c) $sp^3$ hybridized (d) $sp^3d$ hybridized

Similar questions: Each carbon atom of benzene is (2077)

Answer

(a) $sp^2$ hybridized

Each carbon in benzene forms three sigma bonds (two C-C and one C-H) in a plane at $120^\circ$ , and its remaining p orbital forms the delocalised $\pi$ cloud.

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2077 · 1 mark

Each carbon atom of benzene is (a) $sp^2$ hybridized (b) $sp^3$ hybridized (c) $sp$ hybridized (d) $sp^2d$ hybridized

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Answer

(a) $sp^2$ hybridized

Each carbon of benzene forms three sigma bonds (two C-C, one C-H) in a plane at $120^\circ$ , with the remaining p orbital forming the delocalised pi cloud.

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2077 · 1 mark

Hematite is an ore of (a) Iron (b) Copper (c) Mercury (d) Silver

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Answer

(a) Iron

Hematite is $Fe_2O_3$ , a major ore of iron.

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2078 · 1 mark

The Shape of $SF_6$ molecule based on VSEPR theory is (a) linear (b) square planar (c) octahedral (d) trigonal bipyramidal

Similar questions: The Shape of PCl 5 molecule based on VSEPR theory is (2081)

Answer

(c) octahedral In $SF_6$ sulphur has 6 bond pairs and no lone pairs, so the VSEPR shape is octahedral.

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2078 · 1 mark

The rate of reaction is independent of (a) Molecularity (b) temperature (c) particle size of reactant (d) concentration of reactants

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Answer

(a) Molecularity Rate depends on temperature, particle size and concentration. Molecularity is a theoretical count of molecules in an elementary step and does not affect the rate directly.

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2079 · 1 mark

The weight of sodium carbonate required to prepare 1000 mL of its Deci normal solution is (a) 0.53 g (b) 5.3 g (c) 0.053 g (d) 5.6 g

Similar questions: The weight of sodium carbonate required to (2069 · Entrance Examination 2069)

Answer

(b) 5.3 g

Equivalent weight of $Na_2CO_3=\frac{106}{2}=53$ . A decinormal solution is $0.1$ N, so the weight needed per litre is $0.1\times53=5.3$ g.

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2079 · 1 mark

Picric acid is obtained by the nitration of (a) aniline (b) phenol (c) benzene (d) benzoic acid

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Answer

(b) phenol

Phenol is nitrated with conc. $HNO_3$ and conc. $H_2SO_4$ to give 2,4,6-trinitrophenol (picric acid).

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2080 · 1 mark

The actual electronic configuration of copper is (a) $[Ar]3d^94s^2$ (b) $[Ar]3d^{10}4s^1$ (c) $[Ar]3d^84s^2$ (d) $[Ar]3d^74s^2$

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Answer

(b) $[Ar]3d^{10}4s^1$

A fully filled $3d^{10}$ subshell gives extra stability, so one 4s electron moves to 3d.

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2081 · 1 mark

The Shape of $PCl_5$ molecule based on VSEPR theory is (a) Octahedral (b) trigonal bipyramidal (c) trigonal planar (d) Pentagonal bipyramidal

Similar questions: The Shape of SF 6 molecule based on VSEPR theory is (2078)

Answer

(b) trigonal bipyramidal

$PCl_5$ has five bond pairs and no lone pairs on P ( $sp^3d$ ), giving a trigonal bipyramidal shape.

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2081 · 1 mark

Which of the following acid has highest boiling point? (a) $HCOOH$ (b) $CH_3COOH$ (c) $C_2H_5COOH$ (d) $C_3H_7COOH$

Similar questions: Which of the following compounds has highest boiling point? (2070)

Answer

(d) $C_3H_7COOH$

Boiling point increases with molecular mass (stronger van der Waals forces) in a homologous series of carboxylic acids, so butanoic acid is highest.

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2081 · 1 mark

Picric acid is obtained by the nitration of (a) aniline (b) benzene (c) phenol (d) benzoic acid

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Answer

(c) phenol

Phenol on nitration with conc. $HNO_3$ and conc. $H_2SO_4$ gives 2,4,6-trinitrophenol (picric acid).

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2069 · Entrance Examination 2069 · 1 mark

Paraffins are also called (a) alkanes (b) alkenes (c) alkynes (d) ethylenes

Answer

(a) alkanes

Paraffins are saturated hydrocarbons with only single carbon–carbon bonds, which is the definition of alkanes (general formula $C_nH_{2n+2}$ ). The name "paraffin" comes from Latin meaning "little affinity", referring to their low reactivity.

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2069 · Entrance Examination 2069 · 1 mark

A green color is formed in Lassaigne’s test if nitrogen is present in an organic compound. This green color is due to the formation of (a) $Fe_4[Fe(CN)_6]_3$ (b) $Fe(CN)_2$ (c) $Na_4[Fe(CN)_5NOS]$ (d) $Na[Fe(CN)_6]$

Answer

(a) $Fe_4[Fe(CN)_6]_3$

In Lassaigne's test the sodium fusion extract contains $NaCN$ . It reacts with $FeSO_4$ to give sodium ferrocyanide, $Na_4[Fe(CN)_6]$ . On heating with $FeCl_3$ (or on acidifying), this gives ferric ferrocyanide (Prussian blue), $Fe_4[Fe(CN)_6]_3$ , which appears as a green or blue colour and shows that nitrogen is present.

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2069 · Entrance Examination 2069 · 1 mark

$Al_4C_3$ reacts with water to give (a) $C_2H_4$ (b) $C_2H_2$ (c) $H_2$ (d) $CH_4$

Answer

(d) $CH_4$

Aluminium carbide is a methanide: $Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$ . Hydrolysis of the carbide ion gives methane.

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2069 · Entrance Examination 2069 · 1 mark

Aniline on warming with Benzaldehyde (a) acetanilide (b) benzalinide (c) Schiff’s base (d) phenol

Answer

(c) Schiff’s base

Aniline condenses with benzaldehyde on warming to form benzylidene aniline (C₆H₅–N=CH–C₆H₅), which is a typical Schiff’s base (an azomethine, –CH=N–). Acetanilide would require acetic anhydride/acetyl chloride, and phenol is not formed here.

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2069 · Entrance Examination 2069 · 1 mark

Which of the following compounds is used as the best anti-knocking agent? (a) Tetraethyl lead (b) methane (c) methoxy propane (d) methyl cyanide

Answer

(a) Tetraethyl lead

Tetraethyl lead, $\mathrm{Pb(C_{2}H_{5})_{4}}$ , is the classic and most effective anti-knocking agent. It increases the octane number of petrol by decomposing in the engine to form lead/lead oxide species and ethyl radicals, which scavenge the chain-propagating radicals responsible for knocking. It has been phased out because of lead pollution, but among the given options it is the best anti-knocking agent.

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2069 · Entrance Examination 2069 · 1 mark

Chloroform reacts with concentrated $HNO_3$ on heating and yields (a) chloretone (b) chloropicrin (c) carbon tetrachloride (d) carbonyl chloride

Answer

(b) chloropicrin

On heating chloroform with concentrated $HNO_3$ , the hydrogen atom is replaced by the nitro group, giving chloropicrin ( $CCl_3NO_2$ , trichloronitromethane).

$CHCl_3 + HNO_3 \rightarrow CCl_3NO_2 + H_2O$

(Chloretone is formed from chloroform with acetone in the presence of KOH, not with $HNO_3$ .)

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2069 · Entrance Examination 2069 · 1 mark

Which of the following reagents is used to detect the aldehyde group? (a) Ninhydrin reagent (b) Tollen’s reagent (c) Grignard reagent (d) Baeyer’s reagent

Answer

(b) Tollen's reagent

Tollen's reagent (ammoniacal silver nitrate) is reduced by aldehydes to give a silver mirror, so it detects the aldehyde group. Ninhydrin detects amino acids, Baeyer's reagent tests unsaturation, and Grignard reagent is used in synthesis, not detection.

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2069 · Entrance Examination 2069 · 1 mark

Terylene is a (a) addition polymer (b) condensation polymer (c) polyamide (d) polyimide

Answer

(b) condensation polymer

Terylene (PET) is a polyester formed by the condensation polymerisation of ethylene glycol and terephthalic acid, with the elimination of water molecules.

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2069 · Entrance Examination 2069 · 1 mark

The formula of Zinc blende is (a) $ZnCO_3$ (b) ZnS (c) ZnO (d) $ZnO.Fe_2O_3$

Answer

(b) ZnS

Zinc blende is the cubic mineral form of zinc sulfide, ZnS. (ZnCO₃ is calamine/smithsonite, ZnO is zincite, and ZnO·Fe₂O₃ is franklinite.)

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2069 · Entrance Examination 2069 · 1 mark

The oxidation state of iron in Mohr’s salt is (a) +2 (b) +3 (c) +1 (d) 0

Answer

(a) +2

Mohr's salt is ferrous ammonium sulphate, $\mathrm{FeSO_{4}.(NH_{4})_{2}SO_{4}.6H_{2}O}$ . The iron present is in the ferrous form, $\mathrm{Fe^{2+}}$ , so its oxidation state is +2. (In $\mathrm{Fe^{3+}}$ salts such as ferric alum the value would be +3.)

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2069 · Entrance Examination 2069 · 1 mark

Which of the following oxides is acidic? (a) FeO (b) $CO_2$ (c) CO (d) CaO

Answer

(b) $CO_2$

Non-metal oxides are acidic in nature. $CO_2$ dissolves in water to form carbonic acid ( $CO_2 + H_2O \rightarrow H_2CO_3$ ), so it is an acidic oxide. FeO and CaO are basic (metal) oxides, while CO is a neutral oxide.

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2069 · Entrance Examination 2069 · 1 mark

The structure of ammonia molecule is (a) V-shaped (b) tetrahedral (c) linear (d) trigonal pyramidal

Answer

(d) trigonal pyramidal

In NH₃, nitrogen is sp³ hybridised with one lone pair and three bond pairs. The lone pair occupies one corner, so the molecule has a trigonal pyramidal shape (bond angle about 107°), not a regular tetrahedron.

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2069 · Entrance Examination 2069 · 1 mark

Orthophosphoric acid is (a) monobasic acid (b) dibasic acid (c) Tribasic acid (d) tetrabasic acid

Answer

(c) Tribasic acid

Orthophosphoric acid is $\mathrm{H_{3}PO_{4}}$ , which has three ionisable hydrogen atoms and gives three types of anions ( $\mathrm{H_{2}PO_{4}^-}$ , $\mathrm{HPO_{4}^{2-}}$ , $\mathrm{PO_{4}^{3-}}$ ), so it is a tribasic acid.

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2069 · Entrance Examination 2069 · 1 mark

The formula of Epsom salt is (a) $MgSO_4.7H_2O$ (b) MgO (c) $CuSO_4.2H_2O$ (d) CaO

Answer

(a) $MgSO_4.7H_2O$

Epsom salt is hydrated magnesium sulphate, $MgSO_4.7H_2O$ (magnesium sulphate heptahydrate).

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2069 · Entrance Examination 2069 · 1 mark

Ostwald’s process is used for the manufacture of (a) Sulphuric acid (b) nitric acid (c) ammonia (d) white phosphorus

Answer

(b) nitric acid

Ostwald's process manufactures nitric acid by the catalytic oxidation of ammonia (NH₃) to NO, then NO₂, which is absorbed in water. (Sulphuric acid — Contact process; ammonia — Haber process; white phosphorus — electric furnace method.)

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2069 · Entrance Examination 2069 · 1 mark

Among the following elements, the one having highest electron affinity is (a) chlorine (b) fluorine (c) iodine (d) bromine

Answer

(a) chlorine

Electron affinity decreases down the group, but fluorine is an exception: its very small atomic size causes strong electron–electron repulsion in the compact 2p orbital, so its electron affinity is lower than that of chlorine. Hence chlorine has the highest electron affinity among the halogens.

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2069 · Entrance Examination 2069 · 1 mark

44 gm of $CO_2$ is equal to (a) $6.023 \times 10^{23}$ no of $CO_2$ molecule (b) $6.023 \times 10^{21}$ no of $CO_2$ molecule (c) $6.023 \times 10^{19}$ no of $CO_2$ molecule (d) $6.023 \times 10^{18}$ no of $CO_2$ molecule

Answer

(a) $6.023 \times 10^{23}$ no of $CO_2$ molecule

Molar mass of $CO_2$ is $12 + 2(16) = 44$ g/mol. So 44 g of $CO_2$ is exactly 1 mole, which contains Avogadro's number of molecules, i.e. $6.023 \times 10^{23}$ molecules.

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2069 · Entrance Examination 2069 · 1 mark

Equivalent weight of potassium dichromate in acidic medium is equal to (a) Mol. wt/1 (b) Mol. wt/6 (c) Mol. wt/3 (d) Mol. wt/5

Answer

(b) Mol. wt/6

In acidic medium, $\mathrm{Cr_2O_7^{2-}}$ is reduced as $\mathrm{Cr^{6+} \to Cr^{3+}}$ . Each Cr atom gains 3 electrons, and there are 2 Cr atoms, so total electrons gained = $2 \times 3 = 6$ . Hence equivalent weight = molecular weight / 6.

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2069 · Entrance Examination 2069 · 1 mark

Which of the following is the unit of surface tension? (a) dynes.cm (b) $dyne.cm^{-1}$ (c) $dyne.cm^2$ (d) $dyne.cm^{-2}$

Answer

(b) $dyne.cm^{-1}$

Surface tension is force per unit length ( $T = F/L$ ), so its unit is dyne per centimetre, i.e. $dyne\,cm^{-1}$ (SI unit: $N\,m^{-1}$ ).

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2069 · Entrance Examination 2069 · 1 mark

Electrons will distribute themselves in degenerate orbitals so as to retain parallel spin as much as possible. This is called (a) Hund’s rule (b) Aufbau principle (c) Uncertainty principle (d) Paul’s exclusion principle

Answer

(a) Hund’s rule

Hund’s rule states that electrons fill degenerate (same-energy) orbitals singly, with parallel spins, before pairing up. Aufbau principle gives the order of filling of orbitals by energy, and Paul’s exclusion principle limits each orbital to two electrons of opposite spin.

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2069 · Entrance Examination 2069 · 1 mark

If the pH of a solution is 5.2, the hydrogen ion concentration of the solution is (a) $6.3 \times 10^{-5}$ M (b) $6.3 \times 10^{-6}$ M (c) $6.3 \times 10^{-7}$ M (d) $6.3 \times 10^{-4}$ M

Answer

(b) $6.3 \times 10^{-6}$ M

pH $= -\log[\text{H}^+]$ , so $[\text{H}^+] = 10^{-\text{pH}} = 10^{-5.2} = 10^{-6} \times 10^{0.8} = 6.3 \times 10^{-6}$ M.

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2069 · Entrance Examination 2069 · 1 mark

The enthalpy of formation of the compound is (a) always positive (b) always negative (c) can be positive or negative (d) unpredictable

Answer

(c) can be positive or negative

The enthalpy of formation is the heat change when one mole of a compound is formed from its elements in their standard states. It is negative for stable compounds formed exothermically (e.g., $\mathrm{CO_2}$ ) and positive for compounds formed endothermically (e.g., $\mathrm{NO}$ ).

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2070 · 1 mark

The gas obtained by adding water on aluminum carbide is (a) Ethyne (b) ethane (c) methane (d) ethane

Answer

(c) methane

$Al_4C_3+12H_2O\rightarrow 4Al(OH)_3+3CH_4$ Aluminium carbide is a methanide and gives methane on hydrolysis.

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2070 · 1 mark

The mixture of HCl and $ZnCl_2$ is known as (a) Tollen's reagent (b) Baeyer's reagent (c) Lucas reagent (d) Nessler's reagent

Answer

(c) Lucas reagent

Anhydrous $ZnCl_2$ in concentrated HCl is Lucas reagent, used to distinguish primary, secondary and tertiary alcohols.

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2070 · 1 mark

The IUPAC name of n-valeric acid is (a) Pentanoic acid (b) butanoic acid (c) Propanoic acid (d) ethanoic acid

Answer

(a) Pentanoic acid

n-Valeric acid is $CH_3CH_2CH_2CH_2COOH$ , a five-carbon acid.

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2070 · 1 mark

A blood red coloration of ferric sulphocyanide obtained by addition of ferric chloride in sodium extract confirms the presence of (a) Sulphur (b) nitrogen (c) both a and b (d) halogens

Answer

(c) both a and b

In the Lassaigne test, sodium thiocyanate (NaSCN) forms only when both N and S are present. It gives blood-red ferric sulphocyanide, $Fe(SCN)_3$ , with $FeCl_3$ .

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2070 · 1 mark

The compound that undergoes Cannizzaro reaction is (a) $CH_3COOH$ (b) $C_2H_5CHO$ (c) HCHO (d) $CH_3OCH_3$

Answer

(c) HCHO

The Cannizzaro reaction is given by aldehydes with no $\alpha$ -hydrogen. Formaldehyde has none, so on heating with conc. NaOH it gives methanol and sodium formate.

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2070 · 1 mark

Benzene is converted to toluene by (a) Friedel Craft reaction (b) Grignard reaction (c) Wurtz reaction (d) Perkin reaction

Answer

(a) Friedel Craft reaction

Benzene with $CH_3Cl$ in the presence of anhydrous $AlCl_3$ gives toluene (Friedel-Crafts alkylation).

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2070 · 1 mark

The compound that gives positive carbylamine reaction is (a) $(CH_3)_2NH$ (b) $(CH_3)_3N$ (c) $(CH_3)_4N^+$ (d) $(CH_3)NH_2$

Answer

(d) $(CH_3)NH_2$

The carbylamine (isocyanide) test is given only by primary amines. Heated with $CHCl_3$ and alcoholic KOH, $CH_3NH_2$ gives foul-smelling methyl isocyanide.

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2070 · 1 mark

Zinc sulphate ( $ZnSO_4.7H_2O$ ) is also called (a) White vitriol (b) Green vitriol (c) Blue vitriol (d) corrosive sublimate

Answer

(a) White vitriol

$ZnSO_4\cdot7H_2O$ is white vitriol. Green vitriol is $FeSO_4\cdot7H_2O$ and blue vitriol is $CuSO_4\cdot5H_2O$ .

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2070 · 1 mark

Brass is an alloy of (a) Copper and Zinc (b) Copper and Nickel (c) Copper and Tin (d) Copper and Lead

Answer

(a) Copper and Zinc

Brass is mainly Cu (about 60-70%) with Zn (30-40%).

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2070 · 1 mark

The formula of dolomite is (a) $CaCO_3$ (b) $CaCO_3.MgCO_3$ (c) $CaSO_4.2H_2O$ (d) $CaF_2$

Answer

(b) $CaCO_3.MgCO_3$

Dolomite is the double carbonate of calcium and magnesium.

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2070 · 1 mark

The general electronic configuration of zinc is (a) $[Ar]4s^23d^{10}$ (b) $[Ar]4s^13d^{10}$ (c) $[Ar]4s^23d^8$ (d) $[Ar]4s^23d^7$

Answer

(a) $[Ar]4s^23d^{10}$

Zinc has atomic number 30, so its configuration is $[Ar]3d^{10}4s^2$ .

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2070 · 1 mark

Equivalent weight of $KMnO_4$ in neutral medium is (a) 52.6 (b) 158.0 (c) 31.6 (d) 63.0

Answer

(a) 52.6

In neutral medium, $MnO_4^-+2H_2O+3e^-\rightarrow MnO_2+4OH^-$ . Mn changes from +7 to +4, so n = 3 and $E=\frac{158}{3}\approx52.6$

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2070 · 1 mark

Bohr's model was modified by (a) Rutherford (b) Somerfield (c) Dalton (d) Pauli

Answer

(b) Somerfield

Sommerfeld modified Bohr's model by introducing elliptical orbits (and relativistic corrections), which led to the azimuthal quantum number.

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2070 · 1 mark

How many Oxygen atoms are there in 8.0 g of oxygen atoms? (a) $3.011\times10^{23}$ atoms (b) $3.011\times10^{22}$ atoms (c) $3.011\times10^{20}$ atoms (d) $3.011\times10^{19}$ atoms

Answer

(a) $3.011\times10^{23}$ atoms

Moles of O atoms $=8.0/16=0.5$ mol. $N=0.5\times6.022\times10^{23}=3.011\times10^{23}$

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2070 · 1 mark

What is the pH of 0.001 M HCl? (a) 2.0 (b) 3.0 (c) 4.0 (d) 5.0

Answer

(b) 3.0

HCl is a strong acid, so $[H^+]=10^{-3}$ M and $pH=-\log(10^{-3})=3$ .

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2070 · 1 mark

The CGS unit of specific conductance is (a) Siemen cm $^{-1}$ (b) ohm $^{-1}$ cm $^2$ equiv $^{-1}$ (c) Siemen (d) ohm $^{-1}$

Answer

(a) Siemen cm $^{-1}$

Specific conductance $\kappa=\dfrac{1}{\rho}$ , and resistivity has units ohm cm, so $\kappa$ is in ohm $^{-1}$ cm $^{-1}$ , that is S cm $^{-1}$ .

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2070 · 1 mark

Hess's law deals with (a) Total change in heat of reaction (b) Rate of reaction (c) Equilibrium constant of reaction (d) Influence on pressure of volume of gas

Answer

(a) Total change in heat of reaction

Hess's law states that the total enthalpy change of a reaction is the same whether it occurs in one step or several steps.

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2070 · 1 mark

The degree of dissociation of an electrolyte (a) Decreases with dilution (b) Increases with dilution (c) May increase or decrease with dilution (d) Is not affected by dilution

Answer

(b) Increases with dilution

By Ostwald dilution law, $\alpha\approx\sqrt{K/C}$ , so $\alpha$ increases as concentration falls, approaching 1 at infinite dilution.

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2070 · 1 mark

The weight of 100 ml of $NH_3$ gas at NTP is (a) 0.0759 g (b) 0.0579 g (c) 0.0459 g (d) 0.0359 g

Answer

(a) 0.0759 g

At NTP, 22400 ml of $NH_3$ weighs 17 g. $\text{mass}=\frac{100}{22400}\times17=0.0759\ \text{g}$

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2070 · 1 mark

The law of multiple proportions was given by (a) Richter (b) John Dalton (c) Albert Einstein (d) Gay Lussac

Answer

(b) John Dalton

Dalton proposed the law of multiple proportions in 1803. Richter gave reciprocal proportions and Gay-Lussac the law of combining volumes.

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2071 · 1 mark

How many orbitals are possible for principle quantum number 3? (a) 3 (b) 4 (c) 6 (d) 9

Answer

(d) 9

The number of orbitals for a principal quantum number $n$ is $n^2=3^2=9$ (one 3s, three 3p, five 3d).

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2071 · 1 mark

The half-life of an radioisotope is 30 minutes. After how much time the amount of radioisotope left is 1/4th of the original amount? (a) 4 minutes (b) 30 minutes (c) 60 minutes (d) 120 minutes

Answer

(c) 60 minutes

$1/4=(1/2)^2$ , so two half-lives are needed: $2\times30=60$ min.

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2071 · 1 mark

What is oxidation of chlorine in HOCl? (a) +1 (b) 0 (c) -1 (d) +3

Answer

(a) $+1$

In HOCl: H is $+1$ , O is $-2$ , so $+1+x-2=0\Rightarrow x=+1$ .

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2071 · 1 mark

Hemoglobin contains 0.33% iron by weight. Molecular weight of hemoglobin is 67200. The number of iron atoms (At wt of Fe = 55.85) in one molecule of hemoglobin is (a) 2 (b) 4 (c) 6 (d) 8

Answer

(b) 4

Mass of Fe per mole of haemoglobin $=\frac{0.33}{100}\times67200=221.76$ g. $\text{Number of atoms}=\frac{221.76}{55.85}\approx3.97\approx4.$

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2071 · 1 mark

The gas law which deals with the effect of pressure in a given volume of gas at constant temperature is known as (a) Boyle's Law (b) Charles's Law (c) Graham's Law (d) Dalton's Law

Answer

(a) Boyle's Law

At constant temperature, $PV=\text{constant}$ for a fixed mass of gas.

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2071 · 1 mark

Electronic configuration of four elements A, B, C, D are as follow, which will be most metallic? (a) A=2, 8,4 (b) B=2,8,8 (c) C=2,8,1 (d) D=2,8,7

Answer

(c) C = 2, 8, 1

C has one valence electron (group 1, an alkali metal) and loses it most easily, so it is the most metallic. B is a noble gas, D a halogen, A a group 14 element.

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2071 · 1 mark

Consider the reaction $2A+B\to C+D$ . If the concentration of the reactants are increase by three times, the rate of reaction will increase by (a) 3 times (b) 6 times (c) 9 times (d) 27 times

Answer

(d) 27 times

Taking the rate law from the stoichiometry, $\text{rate}=k[A]^2[B]$ . Tripling both concentrations gives $3^2\times3=27$ times.

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2071 · 1 mark

An aqueous solution of NaCl would be (a) Acidic (b) Basic (c) Neutral (d) could be acidic or basic depending upon temperature

Answer

(c) Neutral

NaCl is a salt of a strong acid (HCl) and a strong base (NaOH), so it does not hydrolyse and the solution is neutral.

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2071 · 1 mark

The pH of pure water at $50^\circ$ C would be (a) 7.0 (b) >7.0 (c) <7.0 (d) cannot be predicted

Answer

(c) $<7.0$

The ionisation of water is endothermic, so $K_w$ increases with temperature. At $50^\circ$ C, $[H^+]=[OH^-]>10^{-7}$ M, so pH is slightly below 7 (about 6.6), though the water stays neutral.

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2071 · 1 mark

Which of the following metals generate $H_2$ on treatment with dil. $HNO_3$ ? (a) Zn (b) Mn (c) Cu (d) Pb

Answer

(b) Mn

Very dilute $HNO_3$ is an oxidising acid that normally gives nitrogen oxides, but with Mg and Mn it liberates hydrogen: $Mn + 2HNO_3 \to Mn(NO_3)_2 + H_2$ . Zn, Cu and Pb do not give $H_2$ .

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2071 · 1 mark

1 M $H_2SO_4$ is equal to (a) $1N\ H_2SO_4$ (b) $2N\ H_2SO_4$ (c) $0.5N\ H_2SO_4$ (d) $4N\ H_2SO_4$

Answer

(b) $2N\ H_2SO_4$

Normality = molarity $\times$ n-factor. $H_2SO_4$ is dibasic (n-factor 2), so $1\ M = 2\ N$ .

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2071 · 1 mark

Hydrogen molecule which has parallel spin of two nuclei is called (a) Ortho hydrogen (b) para hydrogen (c) heavy hydrogen (d) nascent hydrogen

Answer

(a) Ortho hydrogen

In ortho hydrogen the two nuclear spins are parallel; in para hydrogen they are antiparallel.

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2071 · 1 mark

Haematite is an ore of (a) Fe (b) Cu (c) Zn (d) Hg

Answer

(a) Fe

Haematite is $Fe_2O_3$ , an ore of iron.

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2071 · 1 mark

Which of the following is not a nucleophile? (a) $BF_3$ (b) $NH_3$ (c) $H_2O$ (d) $OH^-$

Answer

(a) $BF_3$

$BF_3$ has an empty p-orbital on boron, so it accepts an electron pair and is an electrophile (Lewis acid). $NH_3$ , $H_2O$ and $OH^-$ have lone pairs and are nucleophiles.

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2071 · 1 mark

Anti-Markovnikoff addition of HBr is observed in (a) Propene (b) 1-Butane (c) 2-Butene (d) Pent-2-one

Answer

(a) Propene

In the presence of peroxide, HBr adds to an unsymmetrical alkene by a free-radical mechanism against Markovnikoff's rule, giving $CH_3CH_2CH_2Br$ from propene. 2-Butene is symmetrical, and the other options are not alkenes.

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2071 · 1 mark

When oxalic acid crystals and glycerol are mixed and heated to about $110^\circ$ C, the compound obtained is (a) Chloroform (b) diethyl ether (c) acetone (d) formic acid

Answer

(d) Formic acid

Oxalic acid heated with glycerol at about 110 °C gives glycerol monooxalate, which loses $CO_2$ to give glycerol monoformate. This is hydrolysed to formic acid (HCOOH).

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2071 · 1 mark

Which of the following is a meta directing group? (a) $-NH_2$ (b) $-OH$ (c) $-COOH$ (d) $-R$

Answer

(c) $-COOH$

The $-COOH$ group is electron-withdrawing and deactivating, so it directs the incoming group to the meta position. $-NH_2$ , $-OH$ and $-R$ are ortho/para directing.

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2071 · 1 mark

How many position isomers are possible for dichlorobenzene? (a) 2 (b) 3 (c) 4 (d) 6

Answer

(b) 3

Dichlorobenzene has ortho (1,2), meta (1,3) and para (1,4) isomers.

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2071 · 1 mark

Which one of the following is a condensation polymer? (a) Polyethene (b) Terylene (c) PVC (d) Teflon

Answer

(b) Terylene

Terylene (Dacron) is formed from ethylene glycol and terephthalic acid with loss of water, so it is a condensation polymer. The others are addition polymers.

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2071 · 1 mark

Enzymes are (a) Carbohydrates (b) Protein (c) Lipids (d) Nucleic acids

Answer

(b) Protein

Nearly all enzymes are globular proteins that act as biological catalysts.

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2071 · 1 mark

Which base is found only in the nucleotides of RNA? (a) Adenine (b) Guanine (c) Uracil (d) Cytosine

Answer

(c) Uracil

RNA contains A, G, C and uracil, while DNA contains thymine instead of uracil.

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2072 · 1 mark

1.0 g of $HCl$ reacts with 1.0 g of $CaCO_3$ , the volume of $CO_2$ produced at NTP would be equal to (a) 1.0 liters (b) 0.224 liters (c) 2.24 liters (d) 22.4 liters

Answer

(b) 0.224 liters

$CaCO_3+2HCl\to CaCl_2+H_2O+CO_2$ . Moles: $CaCO_3=1/100=0.01$ ; $HCl=1/36.5=0.0274$ (needs 0.02). $CaCO_3$ is limiting, giving 0.01 mol $CO_2$ , which is $0.01\times22.4=0.224$ L at NTP.

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2072 · 1 mark

Magnetic quantum number specifies (a) Orientation of orbitals (b) size of orbitals (c) shape of orbitals (d) magnetic properties of orbitals

Answer

(a) Orientation of orbitals

The magnetic quantum number $m_l$ gives the spatial orientation of an orbital (values $-l$ to $+l$ ).

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2072 · 1 mark

A cooking gas cylinder can withstand a pressure of 20 atmosphere. At $27^\circ C$ the pressure of the containing gas is 10 atmosphere. On raising the temperature, the cylinder will burst when the temperature exceeds (a) $273^\circ$ C (b) $327^\circ$ C (c) $300^\circ$ C (d) $127^\circ$ C

Answer

(b) $327^\circ$ C

At constant volume $P/T$ is constant: $\dfrac{10}{300}=\dfrac{20}{T}$ , so $T=600$ K $=327^\circ$ C.

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2072 · 1 mark

Which of the following methods of expressing concentration is independent of temperature (a) Molality (b) Molarity (c) Normality (d) Grams per liter

Answer

(a) Molality

Molality is moles per kg of solvent, which uses mass and does not change with temperature. Molarity, normality and g/L depend on volume, which changes with temperature.

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2072 · 1 mark

An aqueous solution of $Na_2CO_3$ would be (a) Acidic (b) basic (c) neutral (d) either acidic or basic

Answer

(b) basic

$Na_2CO_3$ is the salt of a strong base and a weak acid; $CO_3^{2-}+H_2O\rightleftharpoons HCO_3^-+OH^-$ makes the solution basic.

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2072 · 1 mark

Which one of the following is not a Lewis base? (a) $H_2O$ (b) $NH_3$ (c) $OH^-$ (d) $BF_3$

Answer

(d) $BF_3$

$BF_3$ has an empty p orbital on boron and accepts an electron pair, so it is a Lewis acid. $H_2O$ , $NH_3$ and $OH^-$ have lone pairs to donate.

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2072 · 1 mark

In alkaline condition $KMnO_4$ reacts as follow: $2KMnO_4+2KOH\to2K_2MnO_4+H_2O+O$ . The Eq. wt. of $KMnO_4$ is (a) M/1 (b) M/2 (c) M/5 (d) M/6

Answer

(a) M/1

In alkaline medium Mn changes from $+7$ in $KMnO_4$ to $+6$ in $K_2MnO_4$ , a gain of one electron. Equivalent weight $=M/1$ .

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2072 · 1 mark

Which of the following is an amphoteric oxide (a) ZnO (b) MgO (c) $SiO_2$ (d) $H_2O$

Answer

(a) ZnO

ZnO reacts with both acids and bases to give salts and water. MgO is basic, $SiO_2$ is acidic, and water is neutral.

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2072 · 1 mark

Dry ice is (a) Ice which is dried by treating with dehydrating agent (b) ice which is super cooled (c) Solid $CO_2$ (d) ice mixed with some organic solvents

Answer

(c) Solid $CO_2$

Dry ice is solid carbon dioxide, which sublimes without melting.

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2072 · 1 mark

Number of atoms in one molecule of sulfur is (a) 8 (b) 4 (c) 2 (d) 1

Answer

(a) 8

Sulfur exists as puckered crown-shaped $S_8$ molecules.

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2072 · 1 mark

Which of the following noble gas is not present in atmosphere? (a) He (b) Ar (c) Ne (d) Rn

Answer

(d) Rn

Radon is radioactive and short-lived, so it is absent from the atmosphere in any practical amount, unlike He, Ne and Ar.

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2072 · 1 mark

Chalcopyrite is an ore of (a) Fe (b) Cu (c) Zn (d) Hg

Answer

(b) Cu

Chalcopyrite is $CuFeS_2$ , the main ore of copper.

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2072 · 1 mark

The substance used as flux in the extraction of iron from hematite in blast furnace is (a) Calcium phosphate (b) Silica (c) Limestone (d) Calcium silicate

Answer

(c) Limestone

$CaCO_3$ decomposes to CaO, which combines with silica gangue to form slag: $CaO+SiO_2\to CaSiO_3$ . Limestone is the flux; calcium silicate is the slag formed.

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2072 · 1 mark

The formula of bleaching powder is (a) Ca(OCl)Cl (b) $CaSO_4.2H_2O$ (c) $2CaSO_4.H_2O$ (d) $MgSO_4.7H_2O$

Answer

(a) Ca(OCl)Cl

Bleaching powder is calcium chlorohypochlorite, $Ca(OCl)Cl$ (also written $CaOCl_2$ ). The other options are gypsum, plaster of Paris and Epsom salt.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

The members of a homologous series have (a) different general formula (b) different molecular weight (c) different chemical properties (d) different method of preparation

Answer

(b) different molecular weight

Members of a homologous series have the same general formula and similar chemical properties and preparation methods, but successive members differ by $-CH_2-$ (14 u) in molecular weight.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

Which of the following reagent cannot be used to distinguish between acetaldehyde and acetone (a) Tollen's reagent (b) Fehling's solution (c) Schiff's reagent (d) $Br_2$ in $CCl_4$

Answer

(d) $Br_2$ in $CCl_4$

Tollens' reagent, Fehling's solution and Schiff's reagent respond to acetaldehyde but not to acetone. $Br_2$ in $CCl_4$ tests for unsaturation and reacts with neither.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

Reduction of nitrobenzene in acidic medium gives (a) aniline (b) azoxybenzene (c) azobenzene (d) hydrazobenzene

Answer

(a) aniline

In acidic medium (Sn/HCl or Fe/HCl), $C_6H_5NO_2+6[H]\to C_6H_5NH_2+2H_2O$ . Azoxybenzene, azobenzene and hydrazobenzene form in alkaline medium.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

When formaldehyde reacts with ammonia, it gives (a) aldehyde ammonia (b) formic acid (c) urotropine (d) methyl amine

Answer

(c) urotropine

$6HCHO+4NH_3\to(CH_2)_6N_4+6H_2O$ . The product is hexamethylenetetramine (urotropine).

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

BHC is an example of (a) Condensation polymer (b) addition polymer (c) azo dye (d) pesticide

Answer

(d) pesticide

BHC (benzene hexachloride, $C_6H_6Cl_6$ ) is an insecticide.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

Protein is a compound having (a) either linkage (b) ester linkage (c) peptide linkage (d) amine linkage

Answer

(c) peptide linkage

Proteins are polymers of amino acids joined by peptide ( $-CO-NH-$ ) bonds.

Answer checked by Claude Sonnet · Oct 21, 2026

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2072 · 1 mark

Which one of the following is present as a sugar unit in DNA? (a) glucose (b) sucrose (c) deoxyribose (d) ribose

Answer

(c) deoxyribose

DNA contains the sugar 2-deoxyribose, while RNA contains ribose.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The oxidation of Fe in $K_3[Fe(CN)_6]$ is (a) +2 (b) +3 (c) +4 (d) +5

Answer

(b) +3

Let the oxidation state of Fe be $x$ : $3(+1)+x+6(-1)=0\Rightarrow x=+3$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

How many oxygen atoms are present in 8.0 g of oxygen? (a) $6.023\times10^{23}$ (b) $3.0115\times10^{23}$ (c) $7.83\times10^{23}$ (d) $5.83\times10^{23}$

Answer

(b) $3.0115\times10^{23}$

8.0 g of O atoms is $8/16=0.5$ mol, so $0.5\times6.023\times10^{23}=3.0115\times10^{23}$ atoms.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

"Atomic orbitals are filled up in the ground state in order of increasing energy level". This statement is called (a) Pauli's Exclusion Principle (b) Hund's rule (c) Aufbau principle (d) Heisenberg's Uncertainty Principle

Answer

(c) Aufbau principle

The Aufbau principle states that orbitals are filled in order of increasing energy.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The spectral region for the Lyman series of hydrogen spectrum lies in the (a) infrared region (b) visible region (c) ultra-violet region (d) microwave region

Answer

(c) ultra-violet region

Lyman series corresponds to transitions to $n=1$ and lies in the ultraviolet.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The crystal structure of sodium chloride is (a) body centered cubic (b) simple cubic (c) hexagonal (d) face centered cubic

Answer

(d) face centered cubic

NaCl has a face-centred cubic lattice of Cl $^-$ ions with Na $^+$ ions in the octahedral holes (6:6 coordination).

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2073 · 1 mark

Ammonia is manufactured by (a) Haber's process (b) Contact process (c) Down's process (d) Ostwald's process

Answer

(a) Haber's process

Ammonia is made by $N_2+3H_2\rightleftharpoons2NH_3$ using an iron catalyst at about 450 to 500 $^\circ$ C and 200 atm. Contact makes $H_2SO_4$ , Ostwald makes $HNO_3$ .

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2073 · 1 mark

An example of acidic oxide is (a) $SO_2$ (b) $N_2O$ (c) CO (d) ZnO

Answer

(a) $SO_2$

$SO_2$ is a non-metal oxide that reacts with water to give an acid ( $H_2SO_3$ ). $N_2O$ and CO are neutral, ZnO is amphoteric.

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2073 · 1 mark

The shape of $BeF_2$ molecule on the bases of VSEPR theory is (a) trigonal planar (b) linear (c) tetrahedral (d) trigonal pyramidal

Answer

(b) linear

$BeF_2$ has two bond pairs and no lone pairs on Be, so the shape is linear (F-Be-F, $180^\circ$ ).

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Which of the following compound is not a primary standard substance? (a) oxalic acid (b) potassium dichromate (c) potassium bromated (d) potassium permanganate

Answer

(d) potassium permanganate

$KMnO_4$ is not available in a pure, stable form (it is partly reduced by organic matter and light), so it is a secondary standard.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

An example of Lewis base is (a) $BF_3$ (b) $SnCl_4$ (c) $FeCl_3$ (d) $NH_3$

Answer

(d) $NH_3$

$NH_3$ has a lone pair of electrons to donate, making it a Lewis base. $BF_3$ , $SnCl_4$ and $FeCl_3$ are electron-deficient Lewis acids.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The unit of equivalent conductivity is (a) $S\,cm^2\,equivalent^{-1}$ (b) $Ohm.cm$ (c) $S\,cm^{-1}$ (d) $S\,cm^2\,mole^{-1}$

Answer

(a) $S\,cm^2\,equivalent^{-1}$

Equivalent conductivity $\Lambda_{eq}=\kappa V$ , where $\kappa$ is in $S\,cm^{-1}$ and $V$ is the volume (cm³) containing one equivalent, giving $S\,cm^2\,equivalent^{-1}$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

1 calorie is equals to (a) 4.184 Joules (b) 5.174 Joules (c) 6.184 Joules (d) 3.184 Joules

Answer

(a) 4.184 Joules

By definition, 1 calorie is the heat needed to raise 1 g of water by 1 °C, and equals 4.184 J.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Gibb's-Helmholtz equation is (a) $\Delta E=Q+W$ (b) $\Delta G=\Delta H-T\Delta S$ (c) $G=H+TS$ (d) $\Delta E=Q-W$

Answer

(b) $\Delta G=\Delta H-T\Delta S$

The Gibbs-Helmholtz relation connects free energy change with enthalpy and entropy changes at constant temperature. Option (a) and (d) are forms of the first law.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The reaction of benzene with alkyl chloride in presence of anhydrous $AlCl_3$ is (a) Friedel Craft's reaction (b) Wurtz's reaction (c) Reimer Tiemann's reaction (d) Grignard reaction

Answer

(a) Friedel Craft's reaction

Benzene with an alkyl chloride and anhydrous $AlCl_3$ gives an alkylbenzene (Friedel-Crafts alkylation): $C_6H_6+RCl\xrightarrow{AlCl_3}C_6H_5R+HCl$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Primary, secondary and tertiary alcohols are distinguished by (a) Victor Meyer's test (b) Tollen's reagent (c) Hoffman's test (d) Beilstein's test

Answer

(a) Victor Meyer's test

Alcohols are converted to alkyl iodides, then nitroalkanes, then treated with $HNO_2$ and alkali. Primary gives a blue colour, secondary a red colour, and tertiary gives no colour.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Williamson's synthesis is used for the preparation of (a) alcohol (b) aldehyde (c) ketone (d) ether

Answer

(d) ether

Williamson's synthesis: $R-ONa+R'-X\rightarrow R-O-R'+NaX$ prepares ethers.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The catalyst used in Rosenmund's reduction is (a) $Pd-CuSO_4$ (b) $Pd-CaSO_4$ (c) $Pd-CuCl_2$ (d) $Pd-BaSO_4$

Answer

(d) $Pd-BaSO_4$

Rosenmund reduction converts an acid chloride to an aldehyde using $H_2$ over Pd poisoned with $BaSO_4$ (and quinoline/sulphur), which stops over-reduction to alcohol.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The reaction of Phenol with concentrated nitric acid and concentrated sulphuric acid gives: (a) picric acid (b) 2 - nitro phenol (c) 4-nitrophenol (d) aniline

Answer

(a) picric acid

Phenol with conc. $HNO_3$ and conc. $H_2SO_4$ is nitrated at all three ortho/para positions to give 2,4,6-trinitrophenol (picric acid).

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

When benzamide is treated with aqueous $Br_2$ in presence of aqueous alkali, the product formed is: (a) aniline (b) benzene (c) toluene (d) nitroso amine

Answer

(a) aniline

This is Hofmann bromamide degradation: $C_6H_5CONH_2+Br_2+4NaOH\rightarrow C_6H_5NH_2+Na_2CO_3+2NaBr+2H_2O$ . The amine has one carbon fewer than the amide.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Amino acid contains (a) $-$ OH group (b) $-$ CHO group (c) $-NH_2$ and $-COOH$ groups (d) $-$ CO group

Answer

(c) $-NH_2$ and $-COOH$ groups

An amino acid has both an amino group and a carboxyl group, general formula $R-CH(NH_2)-COOH$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Martius yellow is an example of (a) direct dyes (b) acid dyes (c) basic dyes (d) mordant dyes

Answer

(b) acid dyes

Martius yellow (2,4-dinitro-1-naphthol) is a nitro dye applied from acidic bath to wool and silk, so it is an acid dye.

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

The molecular formula of green vitriol is (a) $FeCl_3$ (b) $FeSO_4.7H_2O$ (c) $ZnSO_4.7H_2O$ (d) $CuSO_4.5H_2O$

Answer

(b) $FeSO_4.7H_2O$

Green vitriol is hydrated ferrous sulphate. ( $ZnSO_4.7H_2O$ is white vitriol and $CuSO_4.5H_2O$ is blue vitriol.)

Answer checked by Claude Sonnet · Oct 21, 2026

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2073 · 1 mark

Which is the most important ore of Zinc (a) Zincite (b) Zinc blende (c) Framklinite (d) Wilemite

Answer

(b) Zinc blende

The most important ore of zinc is zinc blende (sphalerite), $ZnS$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The number of atoms of carbon present in 25.0g of $CaCO_3$ is (a) $1.505\times10^{23}$ (b) $1.005\times10^{23}$ (c) $1.205\times10^{23}$ (d) $1.303\times10^{23}$

Answer

(a) $1.505\times10^{23}$

Moles of $CaCO_3=25/100=0.25$ mol, and each formula unit has one C atom. Atoms $=0.25\times6.022\times10^{23}=1.505\times10^{23}$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The electronic configuration of chromium is (a) $[Ar]3d^54s^1$ (b) $[Ar]3d^64s^2$ (c) $[Ar]3d^74s^2$ (d) $[Ar]3d^44s^2$

Answer

(a) $[Ar]3d^54s^1$

Chromium takes the half-filled $d^5$ arrangement, which is more stable, so one electron moves from 4s to 3d.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The structure of $CO_2$ molecule is (a) linear (b) tetrahedral (c) angular (d) pyramidal

Answer

(a) linear

In $O=C=O$ carbon has two bonding pairs and no lone pair ( $sp$ hybridisation), so the bond angle is $180^\circ$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The oxidation number of Fe in the compound $Fe_3O_4$ is (a) 1.3333333 (b) +4/3 (c) +2/3 (d) +8/3

Answer

(d) +8/3

For $Fe_3O_4$ : $3x+4(-2)=0$ , so $x=+8/3$ (an average of Fe $^{2+}$ and Fe $^{3+}$ ).

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Down's process is used for the extraction of (a) sodium (b) sodium hydroxide (c) sodium carbonate (d) ammonia

Answer

(a) sodium

Down's process is the electrolysis of fused NaCl (with $CaCl_2$ ) that gives sodium metal at the cathode and chlorine at the anode.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The IUPAC name of $C-(CH_3)_4$ is (a) 2.2 dimethyl propane (b) 2-methyl butane (c) 2-methyl propane (d) Pentane

Answer

(a) 2,2-dimethylpropane

$C(CH_3)_4$ has a three-carbon chain (propane) with two methyl groups on carbon 2.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

$Al_4C_3$ reacts with water to give (a) $CH_4$ (b) $C_2H_2$ (c) $H_2$ (d) $C_2H_4$

Answer

(a) $CH_4$

$Al_4C_3+12H_2O\rightarrow4Al(OH)_3+3CH_4$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Protein is a polymer of (a) glycol (b) glucose (c) $\alpha$ -amino acid (d) pthalic acid

Answer

(c) $\alpha$ -amino acid

Proteins are polyamides formed by peptide linkages between $\alpha$ -amino acids.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Which of the following carbohydrate gives Tollen's test? (a) glucose (b) fructose (c) galactose (d) maltose

Answer

(a) glucose

Glucose has a free aldehyde group and reduces Tollen's reagent to give a silver mirror. Among the given options it is the standard answer.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

DDT is an example of (a) insecticide (b) herbicide (c) fungicide (d) rodenticide

Answer

(a) insecticide

DDT (dichlorodiphenyltrichloroethane) is a chlorinated organic insecticide.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Tranquilizers are substance used for the treatment of (a) cancer (b) mental anxiety (c) physical disorder (d) malaria

Answer

(b) mental anxiety

Tranquilizers are psychotropic drugs that relieve anxiety, tension and mental disorders.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Primary, secondary and tertiary alcohols are distinguished by (a) Hoffman's test (b) Fehling's solution (c) Victor Meyer's test (d) Brillstein's test

Answer

(c) Victor Meyer's test

Alcohols are converted to alkyl iodides, then to nitroalkanes, then treated with $HNO_2$ and NaOH. Primary gives a red colour, secondary a blue colour, and tertiary gives no colour.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The reduction of aldehydes or ketones by amalgamated zinc and concentrated HCl to corresponding alkane is called as (a) Clemenssion reduction (b) Wolf-Kishner reduction (c) Cannizaro's reduction (d) Perkin's reaction

Answer

(a) Clemmensen reduction

$>C=O\xrightarrow{Zn-Hg/\text{conc. HCl}}>CH_2$ . Wolff-Kishner uses hydrazine and KOH.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Which of the following compound is most basic? (a) $NH_3$ (b) $CH_3NH_2$ (c) $(CH_3)_2NH$ (d) $(CH_3)_3N$

Answer

(c) $(CH_3)_2NH$

In aqueous solution, basicity depends on the +I effect together with solvation of the ion. The order is $(CH_3)_2NH>CH_3NH_2>(CH_3)_3N>NH_3$ , so the secondary amine is the most basic.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The molecular formula of the white vitriol is (a) $ZnSO_4.7H_2O$ (b) $Zn(OH)_2$ (c) $ZnCO_3$ (d) ZnO

Answer

(a) $ZnSO_4\cdot7H_2O$

White vitriol is hydrated zinc sulphate.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Cinnabar is an ore of (a) zinc (b) copper (c) mercury (d) iron

Answer

(c) mercury

Cinnabar is HgS, the chief ore of mercury.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The pH of 0.04M $HNO_3$ is (a) 1.4 (b) 2 (c) 3 (d) 4

Answer

(a) 1.4

$HNO_3$ is a strong acid, so $[H^+]=0.04$ M and $pH=-\log(0.04)=1.398\approx1.4$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The unit of cell constant is (a) $Sm^{-1}$ (b) ohm (c) $cm^{-1}$ (d) $ohm^{-1}cm^{-1}$

Answer

(c) $cm^{-1}$

Cell constant $=l/A$ , which has the unit $cm^{-1}$ (equal to $\kappa\times R$ ).

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

Which of the following is an intensive property? (a) Volume (b) mass (c) area (d) concentration

Answer

(d) concentration

Intensive properties do not depend on the amount of matter. Volume, mass and area are extensive.

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2074 · 1 mark

The unit of radioactivity is (a) curie (b) nik/L (c) gauss (d) g/L

Answer

(a) curie

The curie (Ci) is the unit of radioactivity, where $1\ \text{Ci}=3.7\times10^{10}$ disintegrations per second. The SI unit is the becquerel.

Answer checked by Claude Sonnet · Oct 21, 2026

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2074 · 1 mark

The compound $Na_2[Fe(CN)_5NO]$ is known as (a) sodium nitroprusside (b) Prussian blue (c) Tollen's reagent (d) Bayer's reagent

Answer

(a) sodium nitroprusside

$Na_2[Fe(CN)_5NO]$ is sodium nitroprusside, used to detect sulphide ions (violet colour).

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

The mass of one atom of hydrogen is approximately (a) 1.0 g (b) 0.5 g (c) $1.6\times10^{-24}$ g (d) $3.2\times10^{-24}$ g

Answer

(c) $1.6\times10^{-24}$ g

Mass of one H atom $=\frac{1.008}{6.022\times10^{23}}\approx1.67\times10^{-24}$ g.

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2075 · 1 mark

Which property of an element is always a whole number (a) Atomic weight (b) equivalent weight (c) atomic volume (d) atomic number

Answer

(d) atomic number

The atomic number is the number of protons, so it is always a whole number. Atomic weight and equivalent weight can be fractional.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Azimuthal quantum number specifies (a) Size of the orbital (b) Shape of the orbital (c) Energy of orbitals (d) Orientation of the orbital in space

Answer

(b) Shape of the orbital

The azimuthal (angular momentum) quantum number $l$ gives the shape of the orbital: $l=0$ is s (spherical), $l=1$ is p (dumbbell). The principal number gives size and energy, and $m_l$ gives orientation.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Which of the following statement is correct for pure water? With increase in temperature (a) pH increases but pOH decreases (b) pH decreases but pOH increases (c) both pH and pOH increases (d) both pH and pOH decreases

Answer

(d) both pH and pOH decreases

$K_w$ increases with temperature, so $[H^+]$ and $[OH^-]$ both increase in pure water. Hence both pH and pOH decrease (the water stays neutral).

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Which has the highest first ionization potential? (a) Ne (b) Mg (c) Cl (d) Na

Answer

(a) Ne

Ionization energy increases across a period, and noble gases have the highest values because of their stable closed-shell configuration. Ne has the highest among these.

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2075 · 1 mark

The aqueous solution of which of the following salt will be neutral? (a) $Na_2SO_4$ (b) $(NH_4)_2SO_4$ (c) $FeSO_4$ (d) $ZnSO_4$

Answer

(a) $Na_2SO_4$

$Na_2SO_4$ is a salt of a strong base (NaOH) and a strong acid ( $H_2SO_4$ ), so it does not hydrolyse and the solution is neutral. The others contain weak bases and give acidic solutions.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

A first order reaction is 50% completed in 50 minutes, when will 75% of the reaction be completed? (a) 75 minutes (b) 100 minutes (c) 200 minutes (d) 300 minutes

Answer

(b) 100 minutes

The half-life is 50 min. 75% completion means two half-lives ( $100\to50\to25$ % left), so $t=2\times50=100$ min.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Malachite is an ore of (a) Fe (b) Zn (c) Cu (d) Hg

Answer

(c) Cu

Malachite, $CuCO_3\cdot Cu(OH)_2$ , is an ore of copper.

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2075 · 1 mark

In the extraction of iron from hematite using blast furnace, iron oxide is reduced by (a) Silica (b) Coal (c) Limestone (d) CO

Answer

(d) CO

In the blast furnace, coke burns to give CO, which reduces the oxide:

$Fe_2O_3+3CO\to2Fe+3CO_2$

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2075 · 1 mark

Equal volume of 1.0M HCl and 1.0 M NaOH are mixed together. The concentration of the NaCl produced would be (a) 1.0 M (b) 0.5 M (c) 2.0 M (d) 0.1 M

Answer

(b) 0.5 M

Moles of NaCl formed equal moles of acid used, $1.0\times V$ . The total volume is $2V$ .

$[NaCl]=\frac{V}{2V}=0.5\ \text{M}$

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Catalyst used in the oxidation of $SO_2$ to $SO_3$ in the manufacture of sulfuric acid by contact process is (a) Fe Powder (b) Ni Powder (c) ZnO (d) $V_2O_5$

Answer

(d) $V_2O_5$

In the contact process, $2SO_2+O_2\rightleftharpoons2SO_3$ is catalysed by vanadium pentoxide ( $V_2O_5$ ).

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2075 · 1 mark

In a reaction $2A+B\to C+D$ the molecularity of the reaction is (a) 1.0 (b) 0.0 (c) 2.0 (d) 3.0

Answer

(d) 3.0

Molecularity is the number of reacting species in the elementary step: $2A+B$ gives $2+1=3$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Heavy water is (a) Deuterium oxide ( $D_2O$ ) (b) Water in which heavier salts are dissolved (c) $H_3O$ (d) Water formed by the combination of hydrogen and heavier isotope of oxygen

Answer

(a) Deuterium oxide ( $D_2O$ ) Heavy water is water in which ordinary hydrogen is replaced by deuterium ( $^2H$ ), so its formula is $D_2O$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

Coating of Zn on iron for the prevention of rusting is known as (a) Surface coating (b) Electroplating (c) Sherardizing (d) Galvanizing

Answer

(d) Galvanizing Coating iron with a layer of zinc to prevent rusting is called galvanizing. Zinc protects the iron by acting as a sacrificial anode.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

The pair of compounds which cannot exist together in solution is (a) $NaHCO_3$ and NaOH (b) $Na_2CO_3$ and $NaHCO_3$ (c) $Na_2CO_3$ and NaOH (d) $NaHCO_3$ and NaCl

Answer

(a) $NaHCO_3$ and NaOH They react with each other: $NaHCO_3 + NaOH \rightarrow Na_2CO_3 + H_2O$ . Hence they cannot coexist in solution.

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

In benzene all the C-C bonds have same length because of (a) Tautomerism (b) Inductive effect (c) Metamerism (d) Resonance

Answer

(d) Resonance The $\pi$ electrons in benzene are delocalised over the ring (resonance between the Kekule structures), so all C-C bonds have the same length (139 pm).

Answer checked by Claude Sonnet · Oct 21, 2026

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2075 · 1 mark

The organic acid which do not contain $-$ COOH group is (a) Ethanoic acid (b) Oxalic acid (c) Lactic acid (d) Picric acid

Answer

(d) Picric acid Picric acid is 2,4,6-trinitrophenol. Its acidity comes from the phenolic $-$ OH group and not from a $-$ COOH group.

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2075 · 1 mark

The action of $NaNO_2$ /HCl on primary amine gives (a) Alcohol (b) alkyl nitrite (c) Secondary (d) Nitro alkane

Answer

(a) Alcohol A primary amine reacts with $HNO_2$ ( $NaNO_2$ /HCl) to give an alcohol with evolution of $N_2$ : $RNH_2 + HNO_2 \rightarrow ROH + N_2 + H_2O$ .

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2075 · 1 mark

In which of the following reactions, both oxidized and reduced forms of the same compound are obtained. (a) Wurtz reaction (b) Riemer-Tiemann reaction (c) Cannizaro reaction (d) Aldol condensation

Answer

(c) Cannizzaro reaction In this reaction an aldehyde with no $\alpha$ -hydrogen disproportionates in conc. alkali. One molecule is oxidised to the carboxylate and another is reduced to the alcohol.

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2075 · 1 mark

Nitrating of benzene by the use of nitrating mixture is an example of (a) Electrophilic addition (b) Electrophilic substitution (c) Nucleophilic addition (d) Nucleophilic substitution

Answer

(b) Electrophilic substitution The nitrating mixture ( $HNO_3 + H_2SO_4$ ) produces the electrophile $NO_2^+$ , which replaces a hydrogen on the benzene ring.

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2075 · 1 mark

Antiseptic action of Dettol is mainly due to (a) Ampicillin (b) Acetyl salicylic acid (c) Paracetamol (d) Chloroxylenol

Answer

(d) Chloroxylenol Dettol contains chloroxylenol (4-chloro-3,5-dimethylphenol) as its active antiseptic.

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2075 · 1 mark

D.D.T is a (a) Insecticide (b) dye (c) synthetic polymer (d) antiseptic drug

Answer

(a) Insecticide DDT (dichlorodiphenyltrichloroethane) is an organochlorine insecticide.

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2075 · 1 mark

An example of Zwitter ion is (a) Glucose (b) DNA (c) Soap (d) Glycine hydrochloride

Answer

(d) Glycine hydrochloride A zwitter ion carries both a positive and a negative charge in the same molecule, as amino acids such as glycine ( $^+H_3N-CH_2-COO^-$ ) do. Of the options, the amino acid derivative is the intended answer.

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2075 · 1 mark

Fructose is an example of (a) Aldose (b) Ketose (c) Pentose (d) Hexose

Answer

(b) Ketose Fructose has a ketone group ( $C=O$ at C-2) and so is a ketohexose. It is a hexose as well, but ketose is its characteristic classification.

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2076 · 1 mark

The secondary suffix of the IUPAC name of the compound $CHO-CH_2-CHOH-COOH$ is (a) ol (b) al (c) oic acid (d) oal

Answer

(c) oic acid

The compound has -COOH, -CHO and -OH groups. The carboxylic acid group has the highest priority, so it gives the suffix "oic acid"; the other groups become prefixes (formyl, hydroxy).

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2076 · 1 mark

The intermediate product markovnikov's in addition is (a) Carbocation (b) free radical (c) Carbanion (d) All of above

Answer

(a) Carbocation

Markovnikov addition of HX to an alkene proceeds through the more stable carbocation intermediate.

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2076 · 1 mark

Acetylene contains (a) $2\pi$ and $3\sigma$ bond (b) $3\pi$ and $2\sigma$ bond (c) $4\sigma$ and $2\pi$ bond (d) none

Answer

(a) $2\pi$ and $3\sigma$ bond

Acetylene $H-C\equiv C-H$ has two C-H $\sigma$ bonds and a C≡C triple bond made of one $\sigma$ and two $\pi$ bonds: 3 $\sigma$ and 2 $\pi$ .

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2076 · 1 mark

Lewis acid and oxidizing agents are (a) Electrophiles (b) Nucleophiles (c) Both a and b (d) None

Answer

(a) Electrophiles

Lewis acids (electron-pair acceptors) and oxidising agents (electron acceptors) are both electron-loving species, i.e. electrophiles.

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2076 · 1 mark

Wurtz reaction cannot be applied to prepared (a) Methane (b) Ethane (c) Butane (d) Hexane

Answer

(a) Methane

Wurtz reaction $2R-X+2Na\to R-R+2NaX$ joins two alkyl groups, so it gives alkanes with at least two carbons. Methane has one carbon and cannot be made by it.

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2076 · 1 mark

Which of the following will show common ion effect (a) $HCl+HNO_3$ (b) $HCl+NaCl$ (c) $HCl+H_2S$ (d) All of above

Answer

(b) $HCl+NaCl$

Common ion effect needs two substances sharing an ion, here $Cl^-$ . Adding NaCl suppresses the ionisation of HCl.

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2076 · 1 mark

Carboxylic acid has general formula as (a) $C_nH_{2n+2}$ (b) $C_nH_{2n}O$ (c) $C_nH_{2n}O_2$ (d) $C_nH_{2n+2}O$

Answer

(c) $C_nH_{2n}O_2$

Carboxylic acids $R-COOH$ have the general formula $C_nH_{2n}O_2$ , for example acetic acid $C_2H_4O_2$ .

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2076 · 1 mark

$C_6H_{12}O_6$ is formula of (a) Glucose (b) fructose (c) Galactose (d) all of above

Answer

(d) all of above

Glucose, fructose and galactose are all hexose isomers with molecular formula $C_6H_{12}O_6$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

The mass of product is equal to mass of reactants. It is (a) Law of multiple proportion (b) Law of definite proportion (c) Law of conservation of mass (d) Law of combining volume

Answer

(c) Law of conservation of mass

The law states that matter is neither created nor destroyed in a chemical reaction, so total mass of products equals that of reactants.

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

Which of the following orbital has highest energy level (a) 4d (b) 3d (c) 5s (d) 4p

Answer

(a) 4d

By the $(n+l)$ rule: 4d has 4+2 = 6, while 3d, 5s and 4p each have 5. Hence 4d has the highest energy.

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

Oxidation state of oxygen in peroxide (a) 1 (b) -1 (c) -2 (d) 2

Answer

(b) -1

In peroxides such as $H_2O_2$ and $Na_2O_2$ the O-O bond is present and each oxygen has oxidation state $-1$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

Potential of hydrogen electrode is (a) Zero (b) positive (c) negative (d) all

Answer

(a) Zero

The standard hydrogen electrode is the reference electrode and is assigned a potential of exactly 0.00 V.

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2076 · 1 mark

Which of the following has highest size? (a) Na (b) $Mg^+$ (c) $Al^{++}$ (d) All have equal size

Answer

(a) Na

Na, $Mg^+$ and $Al^{++}$ are isoelectronic-like in electron count (11 electrons) but nuclear charge increases from Na (11) to $Mg^+$ (12) to $Al^{++}$ (13), pulling electrons closer. Na is therefore the largest.

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2076 · 1 mark

The molarity of pure water is (a) 0.018M (b) 18M (c) 50M (d) 55.55M

Answer

(d) 55.55M

1 L of water has about 1000 g, i.e. $\frac{1000}{18}=55.55$ mol, so the molarity is 55.55 M.

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2076 · 1 mark

Radioactive isotopes of hydrogen is (a) Protium (b) deuterium (c) Tritium (d) all of above

Answer

(c) Tritium

Protium ( $^1H$ ) and deuterium ( $^2H$ ) are stable. Tritium ( $^3H$ ) is radioactive and emits $\beta$ particles.

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2076 · 1 mark

The catalyst used in the contact process is (a) $V_2O_5$ (b) $Fe(OH)_3$ (c) $CaO$ (d) Fe

Answer

(a) $V_2O_5$

In the contact process, $SO_2$ is oxidised to $SO_3$ over vanadium pentoxide catalyst.

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2076 · 1 mark

Chemical formula of white vitriol (a) ZnS (b) $ZnSO_4.7H_2O$ (c) FeS (d) $FeSO_4.7H_2O$

Answer

(b) $ZnSO_4.7H_2O$

White vitriol is hydrated zinc sulphate. $FeSO_4.7H_2O$ is green vitriol.

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

The type of bonding in protein is (a) Hydrogen bond (b) covalent bond (c) peptide bond (d) all of above

Answer

(c) peptide bond

Amino acids are joined by peptide ( $-CO-NH-$ ) linkages to form proteins.

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2076 · 1 mark

The color of dye is due to presence of certain group containing multiple bonds called (a) Chromophore (b) auxochrome (c) both (d) none

Answer

(a) Chromophore

A chromophore is an unsaturated group (such as $-N=N-$ , $-NO_2$ , $C=O$ ) responsible for colour. Auxochromes only intensify it.

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2076 · 1 mark

Molecular formula of calomel is (a) $HgCl_2$ (b) $Hg_2Cl_2$ (c) $Hg+HgCl_2$ (d) $Hg_2Cl_2+Hg$

Answer

(b) $Hg_2Cl_2$

Calomel is mercurous chloride, $Hg_2Cl_2$ . $HgCl_2$ is corrosive sublimate.

Answer checked by Claude Sonnet · Oct 21, 2026

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2076 · 1 mark

$FeSO_4$ forms brown ring with (a) $NO_3$ (b) $NO_2$ (c) $NO$ (d) $N_2O$

Answer

(a) $NO_3$

In the brown ring test, nitrate is reduced by $FeSO_4$ in conc. $H_2SO_4$ to NO, which forms the brown complex $[Fe(H_2O)_5NO]^{2+}$ .

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2076 · 1 mark

Chalcopyrite is commonly known as (a) Matte (b) lunar caustic (c) fool's gold (d) none

Answer

(c) fool's gold

Chalcopyrite ( $CuFeS_2$ ) has a brassy yellow colour resembling gold, so it is called fool's gold.

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2076 · 1 mark

How many structural isomers are possible for $C_6H_{14}$ (a) 3 (b) 4 (c) 5 (d) 7

Answer

(c) 5

$C_6H_{14}$ has five isomers: n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane and 2,3-dimethylbutane.

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2076 · 1 mark

Rate of first order reaction depends upon (a) Time (b) temperature (c) conc. of reactant (d) all of above

Answer

(c) conc. of reactant

For a first order reaction, rate $=k[A]$ , so it is proportional to the concentration of the reactant (k itself changes only with temperature, and the rate does not depend on time as such).

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2076 · 1 mark

Which of the following is neutral oxide? (a) $CO_2$ (b) $H_2O$ (c) $N_2O_3$ (d) ZnO

Answer

(b) $H_2O$

$CO_2$ and $N_2O_3$ are acidic oxides and ZnO is amphoteric. Water is neutral, as are CO and NO.

Answer checked by Claude Sonnet · Oct 21, 2026

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2077 · 1 mark

Magnetic quantum number specifies (a) orbital size (b) orbital orientation (c) orbital shape (d) nuclear stability

Answer

(b) orbital orientation

The magnetic quantum number $m_l$ gives the orientation of an orbital in space. Size is given by $n$ and shape by $l$ .

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2077 · 1 mark

Which of the following has an electrovalent linkage? (a) $MgCl_2$ (b) $CH_4$ (c) $SiCl_4$ (d) $CCl_4$

Answer

(a) $MgCl_2$

$MgCl_2$ is formed by transfer of electrons from Mg to Cl, giving an ionic (electrovalent) bond. $CH_4$ , $SiCl_4$ and $CCl_4$ are covalent.

Answer checked by Claude Sonnet · Oct 21, 2026

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2077 · 1 mark

The element having highest value of electronegativity is (a) chlorine (b) fluorine (c) bromine (d) Iodine

Answer

(b) fluorine

Fluorine has the highest electronegativity (4.0 on the Pauling scale).

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2077 · 1 mark

Oxidation number of chromium in $Cr_2O_7^{2-}$ is (a) +6 (b) +5 (c) +4 (d) +3

Answer

(a) +6

$2x+7(-2)=-2\Rightarrow2x=12\Rightarrow x=+6$

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2077 · 1 mark

Which of the following is an amphoteric oxide? (a) $CaO$ (b) $MgO$ (c) $CuO$ (d) $ZnO$

Answer

(d) $ZnO$

$ZnO$ reacts with both acids and bases, so it is amphoteric. $CaO$ and $MgO$ are basic, and $CuO$ is basic.

Answer checked by Claude Sonnet · Oct 21, 2026

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2077 · 1 mark

The structure of Buckminster fullerene contains (a) 20 six member rings and 12 five member rings (b) 12 six member rings and 20 five member rings (c) 12 six member rings and 10 five member rings (d) 12 six member rings and 8 five member rings

Answer

(a) 20 six member rings and 12 five member rings

Buckminsterfullerene $C_{60}$ has 20 hexagons and 12 pentagons, like a football.

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2077 · 1 mark

Down's process is used for the extraction of (a) ammonia (b) nitric acid (c) sodium (d) sulphuric acid

Answer

(c) sodium

Down's process extracts sodium by the electrolysis of fused NaCl (with $CaCl_2$ added) using a steel cathode and graphite anode.

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2077 · 1 mark

The IUPAC name of iso-butane is (a) 2-methylpropane (b) 2,2-dimethylpropane (c) 2-methylpropene (d) 2-methylbutane

Answer

(a) 2-methylpropane

Iso-butane is $(CH_3)_2CH{-}CH_3$ : a three-carbon chain (propane) with a methyl group on C-2.

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2077 · 1 mark

An alkaline $KMnO_4$ solution is known as (a) Tollen's reagent (b) Baeyer's reagent (c) Fehiling's reagent (d) Grignard reagent

Answer

(b) Baeyer's reagent

Cold, dilute, alkaline $KMnO_4$ is Baeyer's reagent, used to test for unsaturation.

Answer checked by Claude Sonnet · Oct 21, 2026

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2077 · 1 mark

When haloalkane solution is treated with metallic sodium in presence of dry ether, respective alkane is obtained. This reaction is know as (a) Wurtz reaction (b) Wolf-Kishner reduction (c) Cannizzaro's reaction (d) Reimer-Tiemann reaction

Answer

(a) Wurtz reaction

$2R{-}X+2Na\xrightarrow{\text{dry ether}}R{-}R+2NaX$

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2077 · 1 mark

The general formula of alkanes is (a) $C_nH_{2n}$ (b) $C_nH_{2n+2}$ (c) $C_nH_{2n-2}$ (d) none of the above

Answer

(b) $C_nH_{2n+2}$

Alkanes are saturated hydrocarbons with the general formula $C_nH_{2n+2}$ , e.g. $CH_4$ , $C_2H_6$ .

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2077 · 1 mark

Detection of nitrogen, Sulphur and halogens in organic compounds is done by (a) Lassaigne's test (b) Lacas test (c) Victor Meyer test (d) Carbylamine test

Answer

(a) Lassaigne's test

In Lassaigne's test the organic compound is fused with sodium to give NaCN, $Na_2S$ and NaX, which are then tested for N, S and halogens.

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2077 · 1 mark

The structure of methane is (a) trigonal planar (b) linear (c) tetrahedral (d) square planar

Answer

(c) tetrahedral

In methane carbon is $sp^3$ hybridised with four bond pairs, so the molecule is tetrahedral with H-C-H angle $109.5^\circ$ .

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2077 · 1 mark

Equivalent weight of potassium permanganate in acidic media is equal to its (a) mol.wt./5 (b) mol.wt./3 (c) mol.wt./4 (d) mol.wt./2

Answer

(a) mol.wt./5

In acidic medium $MnO_4^- + 8H^+ + 5e^- \to Mn^{2+} + 4H_2O$ , so 5 electrons are gained and equivalent weight = M/5.

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2077 · 1 mark

An example of lewis base is (a) $BF_3$ (b) $AlCl_3$ (c) $FeCl_3$ (d) $NH_3$

Answer

(d) $NH_3$

A Lewis base donates an electron pair; $NH_3$ has a lone pair on N. $BF_3$ , $AlCl_3$ , $FeCl_3$ are electron-deficient Lewis acids.

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2077 · 1 mark

A device which can generate electricity by means of a redox reaction is called (a) electrochemical (b) galvanic cell (c) voltaic cell (d) all of the above

Answer

(d) all of the above

A device converting chemical energy of a redox reaction into electricity is called an electrochemical, galvanic or voltaic cell; the terms are used interchangeably.

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2077 · 1 mark

1 calorie is equal to (a) 4.184 joules (b) 5.184 joules (c) 3.184 joules (d) 2.184 joules

Answer

(a) 4.184 joules

1 cal = 4.184 J by definition.

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2077 · 1 mark

The rate of a reaction depends on (a) concentration of reacting species (b) temperature (c) surface area of the reactants (d) all of the above

Answer

(d) all of the above

Reaction rate increases with concentration, temperature and (for solids) surface area of the reactants.

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2077 · 1 mark

Which is correct for the reaction of Lucas reagent with tertiary alcohol? (a) no turbidity occurs at room temperature (b) turbidity appears within five minutes (c) turbidity appears immediately (d) turbidity appears within ten minutes

Answer

(c) turbidity appears immediately

Tertiary alcohols react fastest by the $S_N1$ route with Lucas reagent (conc. HCl + anhydrous $ZnCl_2$ ), giving alkyl chloride that makes the solution turbid at once.

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2077 · 1 mark

Fat is a (a) lipid (b) carbohydrate (c) protein (d) amino acid

Answer

(a) lipid

Fats are esters of glycerol with fatty acids and belong to the lipid class.

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2077 · 1 mark

Bakelite is made by the action of (a) phenol and formaldehyde (b) urea and formaldehyde (c) melamine and formaldehyde (d) ethylene glycol and phthalic acid

Answer

(a) phenol and formaldehyde

Bakelite is a thermosetting condensation polymer of phenol and formaldehyde.

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2077 · 1 mark

Which of the following compound is called corrosive sublimate? (a) $Hg_2Cl_2$ (b) $HgCl_2$ (c) $K_2[HgI_4]$ (d) $HgI_3$

Answer

(b) $HgCl_2$

Mercuric chloride is the highly poisonous corrosive sublimate.

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2078 · 1 mark

The number of molecules in 32 g of oxygen is (a) $3.2\times10^{23}$ (b) $6.02\times10^{23}$ (c) $3.2\times10^{16}$ (d) $6.02\times10^{10}$

Answer

(b) $6.02\times10^{23}$ 32 g of $O_2$ is 1 mole (molar mass 32 g/mol), which contains Avogadro's number of molecules.

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2078 · 1 mark

In a given atoms no two electrons can have the same values for all the four quantum numbers. This is called (a) Pauli's exclusion principle (b) Hund's rule (c) Aufbau principle (d) Uncertainty principle

Answer

(a) Pauli's exclusion principle No two electrons in an atom can have the same set of all four quantum numbers $(n, l, m_l, m_s)$ .

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2078 · 1 mark

Which is not the isotope of hydrogen? (a) Protium (b) deuterium (c) tritium (d) fullerene

Answer

(d) fullerene Protium, deuterium and tritium are the isotopes of hydrogen. Fullerene is an allotrope of carbon.

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2078 · 1 mark

The composition of brown ring in nitrate test is (a) $FeSO_4.NO$ (b) $FeSO_4.NO_2$ (c) $FeSO_4.NO_3$ (d) $FeSO_4.N_2O$

Answer

(a) $FeSO_4.NO$ In the brown ring test, nitrate is reduced to NO by $Fe^{2+}$ in acid, and NO combines with $FeSO_4$ to give the brown complex $[Fe(H_2O)_5NO]SO_4$ , written as $FeSO_4.NO$ .

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2078 · 1 mark

The formula of hypo is (a) $Na_2S_2O_3$ (b) $FeSO_4.NO_2$ (c) $FeSO_4.NO_3$ (d) $FeSO_4.N_2O$

Answer

(a) $Na_2S_2O_3$ Hypo is sodium thiosulphate, $Na_2S_2O_3.5H_2O$ , used as a fixer in photography.

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2078 · 1 mark

$MgSO_4.7H_2O$ is known as (a) bleaching powder (b) quicklime (c) Epsom salt (d) plaster of Paris

Answer

(c) Epsom salt $MgSO_4.7H_2O$ is magnesium sulphate heptahydrate, known as Epsom salt.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Minamata disease was caused by consumption of fish containing (a) zinc (b) cadmium (c) arsenic (d) mercury

Answer

(d) mercury Minamata disease (Japan) was caused by eating fish contaminated with methylmercury.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which element can not be detected by Lassaigne's test? (a) Fluorine (b) Sulphur (c) chlorine (d) nitrogen

Answer

(a) Fluorine In Lassaigne's test N, S, Cl, Br and I are detected as NaCN, $Na_2S$ and NaX. Fluorine is not detected because $CaF_2$ and $AgF$ are not precipitated in the usual way (AgF is soluble).

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which of the following reagents can distinguish alkyne form alkane? (a) Fehling's solution (b) ammoniac silver nitrate (c) Bayer's reagent (d) Lucas reagent

Answer

(b) ammoniacal silver nitrate A terminal alkyne has an acidic hydrogen and gives a white precipitate of silver acetylide with Tollens-type ammoniacal $AgNO_3$ . Alkanes do not react.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

The Catalyst used in Friedel Craft's alkylation reaction is (a) Finely dividend nickel (b) Cuprous halide (c) Anhydrous $AlCl_3$ (d) Conc. $H_2SO_4$

Answer

(c) Anhydrous $AlCl_3$ Friedel-Crafts alkylation of benzene with an alkyl halide uses anhydrous $AlCl_3$ , a Lewis acid, as the catalyst.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Urea is an (a) Nitrogenous fertilizer (b) Phosphatic fertilizer (c) Potash fertilizer (d) none of the above

Answer

(a) Nitrogenous fertilizer Urea, $CO(NH_2)_2$ , contains about 46% nitrogen.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

IUPAC name of acetone is (a) 2- butanone (b) 3-pentanone (c) Propan-2-one (d) ethanol

Answer

(c) Propan-2-one Acetone is $CH_3COCH_3$ , a three-carbon ketone with the carbonyl group on C-2.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Equivalent weight of sulphuric acid is equal to its (a) mol.wt./5 (b) mol. Wt./4 (c) mol.wt. /3 (d) mol. wt. /2

Answer

(d) mol. wt./2 $H_2SO_4$ is dibasic and has 2 replaceable $H^+$ ions, so equivalent weight $=98/2=49$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which law of thermodynamics is illustrated by the statement "The total amount of energy in the universe remains constant"? (a) second law (b) first law (c) third law (d) none of the above

Answer

(b) first law The first law, the law of conservation of energy, says that energy can be neither created nor destroyed.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

An example of organophosphate insecticides is (a) DDT (b) BHC (c) Malathion (d) dieldrin

Answer

(c) Malathion Malathion is an organophosphate insecticide. DDT, BHC and dieldrin are organochlorines.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which of the following is not true for aniline? (a) gives coupling reaction (b) reacts with aldehyde (c) typical aromatic amine (d) does not give coupling reaction

Answer

(d) does not give coupling reaction Aniline is a typical aromatic amine. It gives a diazonium salt with $HNO_2$ at 0-5 °C, which couples with phenols and amines to form azo dyes, and it reacts with aldehydes to form Schiff bases. So the statement that it does not couple is false.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Ethyl alcohol of 100 percent purity is called (a) absolute alcohol (b) rectified sprit (c) denatured alcohol (d) all of the above

Answer

(a) absolute alcohol 100% pure ethanol is absolute alcohol. Rectified spirit is about 95.6% and denatured alcohol has additives.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Haloalkane when heated with sodium metal in presence of ether as solvent gives alkanes. This reaction is know as (a) Reimer- Tiemann reaction (b) Wurtz reaction (c) Carbylamine reaction (d) kolbe's reaction

Answer

(b) Wurtz reaction $2R\text{-}X+2Na\xrightarrow{\text{dry ether}}R\text{-}R+2NaX$

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which is not true for ketones? (a) do not reduce Tollen's reagent (b) do not reduce Fehling solution (c) reduce Tollen's reagent (d) do not reduce Benedict solution

Answer

(c) reduce Tollen's reagent Ketones are not oxidised by mild oxidants, so they do not reduce Tollens' reagent, Fehling's solution or Benedict's solution. The statement that they reduce Tollens' reagent is false.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

$CO_2$ is a (a) Lewis base (b) Bronsted acid (c) Bronsted base (d) Lewis acid

Answer

(d) Lewis acid $CO_2$ has an electron-deficient carbon that accepts an electron pair (for example from $OH^-$ or $H_2O$ ), so it is a Lewis acid.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Metal used for galvanizing iron sheet is (a) Zinc (b) copper (c) cadmium (d) cobalt

Answer

(a) Zinc Galvanizing coats iron with zinc, which protects it from rusting.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which of the following compound is called lunar caustic? (a) $Ag_2S$ (b) $AgNO_3$ (c) $AgCl$ (d) $Ag_2O$

Answer

(b) $AgNO_3$ Silver nitrate is called lunar caustic because it cauterises tissue.

Answer checked by Claude Sonnet · Oct 21, 2026

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2078 · 1 mark

Which of the following is the strongest acid? (a) $CH_3COOH$ (b) $ClCH_2COOH$ (c) $Cl_3CCOOH$ (d) $Cl_2CHCOOH$

Answer

(c) $Cl_3CCOOH$ Three electron-withdrawing Cl atoms give the strongest negative inductive effect, which stabilises the carboxylate ion most. Acid strength order is $Cl_3CCOOH > Cl_2CHCOOH > ClCH_2COOH > CH_3COOH$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The concept of pH was introduced by (a) Arrhenius (b) Lewis (c) Bronsted (d) Sorensen

Answer

(d) Sorensen

The pH scale was introduced by the Danish biochemist S. P. L. Sorensen in 1909.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The rate of a chemical reaction increases with (a) increase in particle size of the reactants (b) increase in temperature (c) decrease in temperature (d) decrease in concentration of reactants

Answer

(b) increase in temperature

A rise in temperature increases the number of molecules with energy at least equal to the activation energy, so the rate rises (roughly doubling for every $10^\circ C$ rise).

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

A spontaneous change is one in which the system has (a) an increase in internal energy (b) lowering of entropy (c) lowering of free energy (d) no energy change

Answer

(c) lowering of free energy

A process is spontaneous when $\Delta G<0$ , that is, when the free energy of the system decreases.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following is an example of transition metal? (a) cobalt (b) potassium (c) magnesium (d) silicon

Answer

(a) cobalt

Cobalt is a d-block element with partly filled $3d$ orbitals ( $[Ar]3d^74s^2$ ). Potassium and magnesium are s-block elements, and silicon is a p-block element.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following compound is called blue vitriol? (a) $Cu_2O$ (b) $CuSO_4.5H_2O$ (c) $CuCl_2$ (d) $Cu_2Cl_2$

Answer

(b) $CuSO_4.5H_2O$

Blue vitriol is hydrated copper sulphate (copper sulphate pentahydrate).

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Silver is extracted from its sulphide ore by (a) contact process (b) down's process (c) cyanide process (d) ostwald's

Answer

(c) cyanide process

Silver ore (argentite, $Ag_2S$ ) is leached with dilute NaCN solution in air to form the soluble complex $Na[Ag(CN)_2]$ . Silver is then obtained by displacement with zinc. This is the MacArthur-Forrest cyanide process.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

2,4-Dichlorophenoxyacetic acid (2,4-D) is generally used as (a) a herbicide (b) an insecticide (c) a fungicide (d) none of the above

Answer

(a) a herbicide

2,4-D is a selective weed killer that acts against broad-leaved weeds.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

A class of organometallic compounds of magnesium with the general formula $RMgX$ (where, R is an organic group and X is a halogen atom) is known as (a) Tolle's reagent (b) Nessler's reagent (c) Schiff's reagent (d) Grignard's reagent

Answer

(d) Grignard's reagent

$RMgX$ compounds are Grignard reagents, prepared from an alkyl halide and magnesium in dry ether.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Aldehydes can be distinguished from ketones by (a) Fehling's solution (b) conc. $H_2SO_4$ (c) Grignard's reagent (d) Pyragallol

Answer

(a) Fehling's solution

Aldehydes reduce Fehling's solution to give a red precipitate of $Cu_2O$ . Ketones do not.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following compound is used as anaesthetic? (a) ethylene (b) ethyl alcohol (c) chloroform (d) acetylene

Answer

(c) chloroform

Chloroform ( $CHCl_3$ ) was used as a general anaesthetic.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Aromatic carboxylic acid is (a) formic acid (b) oxalic acid (c) stearic acid (d) cinnamic acid

Answer

(d) cinnamic acid

Cinnamic acid ( $C_6H_5CH=CHCOOH$ ) contains a benzene ring. Formic, oxalic and stearic acids are aliphatic.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following compound is called urea? (a) $NH_2CONH_2$ (b) $NH_2COONH_4$ (c) $H_2NNHCONH_2$ (d) $H_2NCOHC_2H_5$

Answer

(a) $NH_2CONH_2$

Urea is the diamide of carbonic acid, $NH_2CONH_2$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Ethyne reacts with alkaline $KMnO_4$ solution to give (a) glyoxal (b) oxalic acid (c) ethanoic acid (d) acetic acid

Answer

(b) oxalic acid

Alkaline $KMnO_4$ oxidises ethyne to oxalic acid (as potassium oxalate), with the purple colour of the permanganate disappearing:

$HC\equiv CH+4[O]\rightarrow HOOC-COOH$

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

IUPAC name of acetaldehyde is (a) menthanal (b) propogane (c) ethanal (d) butanal

Answer

(c) ethanal

Acetaldehyde is $CH_3CHO$ . Its IUPAC name is ethanal.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which is the most toxic chemical forms of mercury? (a) $Hg$ (b) $Hg_2^{2+}$ (c) $Hg^{2+}$ (d) $CH_3Hg^+$

Answer

(d) $CH_3Hg^+$

Methylmercury is the most toxic form. It is lipid soluble, is readily absorbed, and accumulates in the food chain (as in Minamata disease).

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The number of molecules in 32 g of oxygen is (a) $6.02\times10^{23}$ (b) $6.02\times10^9$ (c) $3.2\times10^{23}$ (d) $3.2\times10^{16}$

Answer

(a) $6.02\times10^{23}$

$n=\frac{32}{32}=1\text{ mol of }O_2$

This contains $N_A=6.02\times10^{23}$ molecules.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The outermost electronic configuration of chromium is (a) $3d^24s^2$ (b) $3d^54s^1$ (c) $3d^54s^2$ (d) $3d^64s^2$

Answer

(b) $3d^54s^1$

Chromium ( $Z=24$ ) is an exception, because half-filled $3d^5$ is extra stable: $[Ar]3d^54s^1$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following has the lowest ionic radius? (a) $O^{2-}$ (b) $F^-$ (c) $Al^{3+}$ (d) $Na^+$

Answer

(c) $Al^{3+}$

The ions $O^{2-}, F^-, Na^+, Al^{3+}$ are isoelectronic (10 electrons). The radius decreases as the nuclear charge increases, so $Al^{3+}$ is smallest.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following hydrogen halides has the lowest dipole moment? (a) $HF$ (b) $HCl$ (c) $HBr$ (d) $HI$

Answer

(d) $HI$

Dipole moment decreases with falling electronegativity of the halogen: $HF>HCl>HBr>HI$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The value of universal gas constant (R) is SI unit is (a) 8.314 joule $K^{-1}mol^{-1}$ (b) 5.314 joule $k^{-1}mol^{-1}$ (c) 3.501 joule $K^{-1}mol^{-1}$ (d) $8.314*10^7$ ergs $K^{-1}mol^{-1}$

Answer

(a) $8.314\ \text{J K}^{-1}\text{mol}^{-1}$

In SI units $R = 8.314$ J per kelvin per mole. The value in ergs ( $8.314\times10^7$ ) is the CGS value, not SI.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

An example of acidic oxide is (a) HCL (b) HBr (c) HF (d) HI

Answer

(a) HCl

HCl is the only strong acid among the options, and it gives an acidic (hydrochloric acid) solution in water. HF, HBr and HI are also acidic hydrogen halides, but HCl is the standard example.

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

The iconic character is H-X bond is highest in (a) HCl (b) $HB_r$ (c) HF (d) HI

Answer

(c) HF

Ionic character of the H-X bond depends on the electronegativity difference. Fluorine is the most electronegative halogen, so H-F is the most polar and has the highest ionic character (HF > HCl > HBr > HI).

Answer checked by Claude Sonnet · Oct 21, 2026

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2079 · 1 mark

Which of the following compounds is called magnesia? (a) $MgSO_47H_2O$ (b) $MgCl_26H_2O$ (c) $MgCl_2$ (d) $Mg(OH)_2$

Answer

(d) $Mg(OH)_2$

Magnesium hydroxide suspension is called milk of magnesia, used as an antacid.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The law of conservation of mass was developed by (a) Antoine Laurent de Lavoisier (b) Joseph Louis Proust (c) John Dalton (d) Niels Bohr

Answer

(a) Antoine Laurent de Lavoisier

Lavoisier proposed the law of conservation of mass in 1789.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The most electronegative element in the periodic table is (a) chlorine (b) oxygen (c) fluorine (d) nitrogen

Answer

(c) fluorine

Fluorine has the highest electronegativity (4.0 on the Pauling scale).

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2080 · 1 mark

The shape of $NH_3$ molecule is (a) square planar (b) linear (c) tetrahedral (d) pyramidal

Answer

(d) pyramidal

N has three bond pairs and one lone pair ( $sp^3$ ), giving a trigonal pyramidal shape.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The number of water molecules associated with copper sulphate is (a) 5 (b) 7 (c) 2 (d) 10

Answer

(a) 5

Blue vitriol is $CuSO_4\cdot5H_2O$ .

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2080 · 1 mark

Brass is a/an (a) metalloid (b) alloy (c) non-metal (d) alkali metal

Answer

(b) alloy

Brass is an alloy of copper and zinc.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The compound formed during the ring test for nitrate is (a) $FeSO_4.NO_2$ (b) $Fe(NO_3)_3$ (c) $FeSO_4.NO$ (d) $Fe(NO_3)_2$

Answer

(c) $FeSO_4.NO$

In the brown ring test, nitrate is reduced by $Fe^{2+}$ to NO, which forms the brown complex $[Fe(H_2O)_5NO]^{2+}$ , written as $FeSO_4\cdot NO$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Kipp's apparatus is used for the preparation of (a) $Cl_2$ (b) $SO_2$ (c) $CO_2$ (d) $H_2S$

Answer

(d) $H_2S$

Kipp's apparatus is used for the convenient preparation of gases such as $H_2S$ (from FeS and dilute acid), also $CO_2$ and $H_2$ , by reacting a solid with a liquid without heating.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The metal ion present in chlorophyll is (a) $Mg^{2+}$ (b) $Ca^{2+}$ (c) $Ba^{2+}$ (d) $Cu^{2+}$

Answer

(a) $Mg^{2+}$

Chlorophyll has magnesium at the centre of its porphyrin ring.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Tetrahedral structure of carbon was proposed by (a) Linus Pauling (b) van't Hoff and Le Bell (c) Robert Corey (d) James Waston

Answer

(b) van't Hoff and Le Bell

In 1874 van't Hoff and Le Bel independently proposed the tetrahedral carbon atom.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Haber's process is used for the manufacture of (a) sulphuric acid (b) nitric acid (c) ammonia (d) sodium hydroxide

Answer

(c) ammonia

Haber's process makes ammonia: $N_2+3H_2\rightleftharpoons2NH_3$ .

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2080 · 1 mark

Benzene was isolated first by (a) Berzelius (b) Cavandish (c) Wohler (d) Faraday

Answer

(d) Faraday Benzene was first isolated by Michael Faraday in 1825 from the oily residue of illuminating gas.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Prussian blue is (a) $Fe_4[Fe(CN)_6]_3$ (b) $Na_4[Fe(CN)_6]$ (c) $Fe(CNS)_3$ (d) $Na_2[Fe(CN)_5NO]$

Answer

(a) $Fe_4[Fe(CN)_6]_3$ Prussian blue is ferric ferrocyanide, formed when $Fe^{3+}$ reacts with $[Fe(CN)_6]^{4-}$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Which of the followings is related to Uranium series? (a) $4n$ (b) $(4n+2)$ (c) $(4n+1)$ (d) $(4n+3)$

Answer

(b) $(4n+2)$ The uranium (radium) series has mass numbers of the form $4n+2$ , starting at $^{238}U$ and ending at stable $^{206}Pb$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

An example of condensation polymer is (a) polystyrene (b) teflone (c) bakelite (d) polyvinyl chloride

Answer

(c) bakelite Bakelite is formed by condensation of phenol and formaldehyde with loss of water. The others are addition polymers.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Which is correct for transition elements? (a) exhibit inert pair effect (b) have low melting points (c) do not show catalytic activity (d) exhibit variable oxidation states

Answer

(d) exhibit variable oxidation states Transition elements use both $ns$ and $(n-1)d$ electrons, so they show variable oxidation states. They also have high melting points and good catalytic activity.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Corrosive sublimate is (a) $HgCl_2$ (b) $Hg_2Cl_2$ (c) $HgI_2$ (d) $HgO$

Answer

(a) $HgCl_2$ Mercuric chloride is called corrosive sublimate because it is poisonous and sublimes on heating. $Hg_2Cl_2$ is calomel.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The major product of reaction between ethanol and potassium dichromate in presence of sulphuric acid is (a) $CH_3COCH_3$ (b) $CH_3COOH$ (c) $HCHO$ (d) $CH_3COOCH_2CH_3$

Answer

(b) $CH_3COOH$ Acidified $K_2Cr_2O_7$ oxidises ethanol first to acetaldehyde and then further to acetic acid.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

IUPAC name of formic acid is (a) ethanoic acid (b) propanoic acid (c) methanoic acid (d) butanoic acid

Answer

(c) methanoic acid Formic acid, $HCOOH$ , has one carbon atom, so its IUPAC name is methanoic acid.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Ammonical silver nitrate solution is known as (a) Baeyer's reagent (b) Schiff's reagent (c) Fehling's solution (d) Tollen's reagent

Answer

(d) Tollen's reagent Ammoniacal silver nitrate, $[Ag(NH_3)_2]^+$ , is Tollens' reagent, used to detect aldehydes (silver mirror test).

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2080 · 1 mark

The reduction of nitrobenzene in neutral medium gives (a) phenyl hydroxylamine (b) aniline (c) hydrazobenzene (d) all of the above

Answer

(a) phenyl hydroxylamine In neutral medium (e.g. Zn dust with $NH_4Cl$ ), nitrobenzene is reduced to N-phenylhydroxylamine. Aniline forms in acidic medium and hydrazobenzene in alkaline medium.

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2080 · 1 mark

The reaction of ketone with Grignard's reagent gives (a) primary alcohol (b) tertiary alcohol (c) secondary alcohol (d) carboxylic acid

Answer

(b) tertiary alcohol A Grignard reagent adds to the ketone carbonyl, and hydrolysis of the adduct gives a tertiary alcohol. Formaldehyde gives a primary alcohol and other aldehydes give secondary alcohols.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

Which of the followings is not a primary standard substance? (a) $(COOH)_2$ (b) $K_2Cr_2O_7$ (c) $KMnO_4$ (d) $NaCl$

Answer

(c) $KMnO_4$ $KMnO_4$ is not a primary standard because it is not pure and is partly reduced by traces of organic matter, so its solution must be standardised.

Answer checked by Claude Sonnet · Oct 21, 2026

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2080 · 1 mark

The factor which does not influence the rate of reaction is (a) concentration (b) temperature (c) nature of reactants (d) molecularity

Answer

(d) molecularity Rate depends on concentration, temperature and the nature of reactants. Molecularity is the number of molecules in the elementary step and is not a factor affecting the rate.

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2080 · 1 mark

An intensive property is (a) density (b) mass (c) volume (d) enthalpy

Answer

(a) density An intensive property does not depend on the amount of matter. Mass, volume and enthalpy are extensive.

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2081 · 1 mark

Benzene molecule is (a) planar (b) trigonal (c) pyraruidal (d) tetrahedral

Answer

(a) planar

Benzene has six sp² carbons in a flat regular hexagon with bond angles of $120^\circ$ .

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2081 · 1 mark

Ethanol and diethyl ether are (a) Positional isomers (b) metameres (c) Chainisomres (d) functional isomers

Answer

(d) functional isomers

Ethanol $C_2H_5OH$ (alcohol) and diethyl ether $C_2H_5OC_2H_5$ differ in functional group, but they have different formulae ( $C_2H_6O$ vs $C_4H_{10}O$ ); among the options the functional-isomer type is the intended answer.

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2081 · 1 mark

The function of myoglobin is (a) Storage of oxygen (b) Storage of metalions (c) Transport of oxygen (d) all of the above

Answer

(a) Storage of oxygen

Myoglobin, an iron-containing protein in muscle, stores oxygen; haemoglobin transports it.

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2081 · 1 mark

Bronze is an alloy of (a) $Cu$ & $Zn$ (b) $Cu$ & $Sn$ (c) $Fe$ & Carbon (d) $Zn$ & $Fe$

Answer

(b) $Cu$ & $Sn$

Bronze is copper with tin (brass is Cu and Zn).

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2081 · 1 mark

The reaction of conc. $HNO_3$ with iron gives. (a) $Fe(NO_3)_3$ (b) $Fe_2O_3$ (c) $Fe_3O_4$ (d) $Fe(NO_3)_2$

Answer

(c) $Fe_3O_4$

Concentrated $HNO_3$ makes iron passive by forming a protective oxide layer of $Fe_3O_4$ , so no nitrate forms.

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2081 · 1 mark

Oxidation number of Cl in $NaClO_3$ is (a) 0 (b) -1 (c) +5 (d) +1

Answer

(c) +5

Let Cl be $x$ : $+1 + x + 3(-2) = 0$ , so $x = +5$ .

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2081 · 1 mark

According to IUPAC classification of elements noble gas are placed in group (a) 18 (b) 17 (c) 3 (d) 2

Answer

(a) 18

Noble gases (He, Ne, Ar, Kr, Xe, Rn) form group 18 in the IUPAC periodic table.

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2081 · 1 mark

The principle quantum number of an atom is related to the (a) Shape of subshell (b) size of the shell (c) Orientation of the orbitals (d) Spin of the electron

Answer

(b) size of the shell

The principal quantum number $n$ gives the main energy level and the size of the shell. Shape is given by $l$ , orientation by $m_l$ and spin by $m_s$ .

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2081 · 1 mark

The number of molecules in 32.0 g of Oxygen gas is (a) $6.023\times10^{23}$ (b) $3.023\times10^{21}$ (c) $6.023\times10^{22}$ (d) $6.023\times10^{20}$

Answer

(a) $6.023\times10^{23}$

Molar mass of $O_2$ = 32 g/mol, so 32.0 g = 1 mol, which contains $6.023\times10^{23}$ molecules.

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2081 · 1 mark

A mixture containing camphor & sand can be separated by (a) Crystallization (b) filtration (c) sedimentation (d) Sublimation

Answer

(d) Sublimation

Camphor sublimes on heating while sand does not, so the vapour is collected and condensed separately.

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2081 · 1 mark

Titration between Silver nitrate & Sodium chloride is called (a) Complex metric titration (b) Precipitation titration (c) redox titration (d) acid base titration

Answer

(b) Precipitation titration

$AgNO_3 + NaCl \rightarrow AgCl\downarrow + NaNO_3$ ; the endpoint is detected by formation of an insoluble precipitate (Mohr/Volhard method).

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2081 · 1 mark

Ostwald's dilution law is applied for the ionization of (a) $NH_4Cl$ (b) $NaOH$ (c) $NH_4OH$ (d) $NaCl$

Answer

(c) $NH_4OH$

Ostwald's dilution law applies to weak electrolytes. $NH_4OH$ is a weak base, whereas $NaOH$ , $NaCl$ and $NH_4Cl$ are strong (fully ionized) electrolytes.

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2081 · 1 mark

The apparatus used for the experimental determination of heat of a reaction is called (a) Calorimeter (b) thermometer (c) colorimeter (d) voltmeter

Answer

(a) Calorimeter

Heat of reaction is measured by the temperature change in a calorimeter (e.g. bomb calorimeter).

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2081 · 1 mark

The equation used to calculate the emf of an electrochemical cell is (a) Boltzmann equation (b) Henderson's equation (c) Nernst equation (d) Ostwald's equation

Answer

(c) Nernst equation

$E = E^\circ - \frac{0.0591}{n}\log Q$ at 25 C gives the emf of a cell under non-standard conditions.

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2081 · 1 mark

Talen's reagent is (a) ammoniacal Silver nitrate solution (b) ammonical Silver bromide (c) ammoniacal Cuprous Chloride (d) ammonical cuprous oxide

Answer

(a) ammoniacal Silver nitrate solution

Tollens' reagent is $[Ag(NH_3)_2]^+$ (ammoniacal $AgNO_3$ ), used to test aldehydes (silver mirror).

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2081 · 1 mark

When Chloroform is heated with zinc dust and water it gives: (a) $CH_4$ (b) $CH_2Cl_2$ (c) $C_2H_4$ (d) $C_2H_6$

Answer

(a) $CH_4$

$CHCl_3 + 3[H] \xrightarrow{Zn/H_2O} CH_4 + 3HCl$ (reduction of chloroform to methane).

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2081 · 1 mark

Cinnabar is ore of (a) Fe (b) Cu (c) Hg (d) Zn

Answer

(c) Hg

Cinnabar is mercuric sulphide, $HgS$ , the chief ore of mercury.

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2081 · 1 mark

$N_2O$ gas is evolved when copper reacts with (a) conc $HNO_3$ (b) dilute $HNO_3$ (c) Moderately conc $NHO_3$ (d) hot and conc $HNO_3$

Answer

(b) dilute $HNO_3$

Among the given choices, copper with dilute nitric acid is the one taken to give $N_2O$ (a lower oxide of nitrogen), whereas conc. acid gives $NO_2$ .

Answer checked by Claude Sonnet · Oct 21, 2026

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2081 · 1 mark

The number of unpaired electron present in 3d-orbital of $Fe^{3+}$ ion is (a) 4 (b) 3 (c) 5 (d) 6

Answer

(c) 5

$Fe$ : $[Ar]3d^64s^2$ ; $Fe^{3+}$ : $[Ar]3d^5$ , with all five 3d electrons unpaired.

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2081 · 1 mark

Gypsum used in cement manufacturing process acts as (a) retarder (b) accelerator (c) plasticizer (d) both a and b

Answer

(a) retarder

Gypsum (2-3%) is added to cement clinker to slow the setting time, preventing flash set.

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Past questions and answers

1.The unit of rate constant for first order reaction is (a) sec−1sec^{-1}sec−1 (b) mol sec−1mol\ sec^{-1}mol sec−1 (c) mol sec−1mol\ sec^{-1}mol sec−1 (d) litre mol−2s−1litre\ mol^{-2} s^{-1}litre mol−2s−1

2.The unit of rate constant for first order reaction is (a) mol s−1mol\ s^{-1}mol s−1 (b) L mol−2s−1L\ mol^{-2}s^{-1}L mol−2s−1 (c) s−1s^{-1}s−1 (d) mol L−1s−1mol\ L^{-1}s^{-1}mol L−1s−1

3.The unit of rate constant for first order reaction is (a) Sec−1Sec^{-1}Sec−1 (b) mol Sec−1mol\ Sec^{-1}mol Sec−1 (c) mol−1 Sec−1mol^{-1}\ Sec^{-1}mol−1 Sec−1 (d) liter2 mol−2 S−1liter^2\ mol^{-2}\ S^{-1}liter2 mol−2 S−1

4.The unit of rate constant for third order reaction is (a) S−1S^{-1}S−1 (b) mol−2L2S−1mol^{-2}L^2S^{-1}mol−2L2S−1 (c) mol−1LS−1mol^{-1}LS^{-1}mol−1LS−1 (d) mol L−1S−1mol\ L^{-1}S^{-1}mol L−1S−1

5.The unit of first order rate constant is (a) time−1conc−1time^{-1}conc^{-1}time−1conc−1 (b) time conc−1time\ conc^{-1}time conc−1 (c) conc.time−1conc.time^{-1}conc.time−1 (d) time−1time^{-1}time−1

6.Na2ONa_2ONa2​O is a (a) Neutral oxide (b) acidic oxide (c) Basic oxide (d) amphoteric oxide

7.Which of the following elements has highest electron affinity? (a) chlorine (b) bromine (c) iodine (d) fluorine

8.MgO is an example of (a) basic oxide (b) amphoteric oxide (c) neutral oxide (d) acidic oxide

9.PbO is an example of (a) amphoteric oxide (b) neutral Oxide (c) acidic Oxide (d) basic Oxide

10.The weight of sodium carbonate required to prepare 100 mL of Deci normal sodium carbonate solution is (a) 0.53 gm (b) 5.3 gm (c) 0.353 gm (d) 5.6 gm

11.The actual electronic configuration of copper is (a) [Ar]4s23d8[Ar]4s^2 3d^8[Ar]4s23d8 (b) [Ar]4s13d10[Ar]4s^1 3d^{10}[Ar]4s13d10 (c) [Ar]4s23d10[Ar]4s^2 3d^{10}[Ar]4s23d10 (d) [Ar]4s23d8[Ar]4s^2 3d^8[Ar]4s23d8

12.Which of the following compounds has highest boiling point? (a) CH4CH_4CH4​ (b) CH3ClCH_3ClCH3​Cl (c) CH3BrCH_3BrCH3​Br (d) CH3OHCH_3OHCH3​OH

13.Hematite is an ore of (a) Silver (b) Iron (c) Mercury (d) Copper

14.Which of the following elements has highest electronegativity? (a) Bromine (b) Iodine (c) Chlorine (d) Fluorine

15.The rate of reaction is independent of (a) Temperature (b) concentration (c) Particle size of reactant (d) Molecularity

16.The number of moles of water present in 18g of water is (a) 18 (b) 1 (c) 1.8 (d) 180

17.In which of the following compound the molecular geometry cannot be predicted by the use of VSEPR theory? (a) C2H6C_2H_6C2​H6​ (b) H2OH_2OH2​O (c) CH4CH_4CH4​ (d) NH3NH_3NH3​

18.Ammonia is manufactured by the use of (a) Solvay's process (b) Haber's process (c) Ostwald's process (d) Down's process

19.Penicillin is an example of (a) Antiseptic drug (b) Antipyretic drug (c) Antibiotic drug (d) Analgesic drug

20.The number of moles present in 90 g of water is (a) 1.0 (b) 90.0 (c) 5.0 (d) 9.0

21.The molecular geometry of which compound cannot be predicted by the application of VSEPR theory? (a) CH4CH_4CH4​ (b) PCl5PCl_5PCl5​ (c) SF6SF_6SF6​ (d) MgCl2MgCl_2MgCl2​

22.Ammonia is manufactured by the use of (a) Down's Process (b) Solvay's Process (c) Haber's Process (d) Ostwald's Process

23.Dettol is an example of (a) analgesic drug (b) antipyretic drug (c) antibiotic drug (d) antiseptic drug

24.Which of the following halogens has highest electron affinity? (a) fluorine (b) iodine (c) bromine (d) chlorine

25.Each carbon atom in benzene is (a) sp2sp^2sp2 hybridized (b) spspsp hybridized (c) sp3sp^3sp3 hybridized (d) sp3dsp^3dsp3d hybridized

26.Each carbon atom of benzene is (a) sp2sp^2sp2 hybridized (b) sp3sp^3sp3 hybridized (c) spspsp hybridized (d) sp2dsp^2dsp2d hybridized

27.Hematite is an ore of (a) Iron (b) Copper (c) Mercury (d) Silver

28.The Shape of SF6SF_6SF6​ molecule based on VSEPR theory is (a) linear (b) square planar (c) octahedral (d) trigonal bipyramidal

29.The rate of reaction is independent of (a) Molecularity (b) temperature (c) particle size of reactant (d) concentration of reactants

30.The weight of sodium carbonate required to prepare 1000 mL of its Deci normal solution is (a) 0.53 g (b) 5.3 g (c) 0.053 g (d) 5.6 g

31.Picric acid is obtained by the nitration of (a) aniline (b) phenol (c) benzene (d) benzoic acid

32.The actual electronic configuration of copper is (a) [Ar]3d94s2[Ar]3d^94s^2[Ar]3d94s2 (b) [Ar]3d104s1[Ar]3d^{10}4s^1[Ar]3d104s1 (c) [Ar]3d84s2[Ar]3d^84s^2[Ar]3d84s2 (d) [Ar]3d74s2[Ar]3d^74s^2[Ar]3d74s2

33.The Shape of PCl5PCl_5PCl5​ molecule based on VSEPR theory is (a) Octahedral (b) trigonal bipyramidal (c) trigonal planar (d) Pentagonal bipyramidal

34.Which of the following acid has highest boiling point? (a) HCOOHHCOOHHCOOH (b) CH3COOHCH_3COOHCH3​COOH (c) C2H5COOHC_2H_5COOHC2​H5​COOH (d) C3H7COOHC_3H_7COOHC3​H7​COOH

35.Picric acid is obtained by the nitration of (a) aniline (b) benzene (c) phenol (d) benzoic acid

36.Paraffins are also called (a) alkanes (b) alkenes (c) alkynes (d) ethylenes

38.Al4C3Al_4C_3Al4​C3​ reacts with water to give (a) C2H4C_2H_4C2​H4​ (b) C2H2C_2H_2C2​H2​ (c) H2H_2H2​ (d) CH4CH_4CH4​

39.Aniline on warming with Benzaldehyde (a) acetanilide (b) benzalinide (c) Schiff’s base (d) phenol

40.Which of the following compounds is used as the best anti-knocking agent? (a) Tetraethyl lead (b) methane (c) methoxy propane (d) methyl cyanide

41.Chloroform reacts with concentrated HNO3HNO_3HNO3​ on heating and yields (a) chloretone (b) chloropicrin (c) carbon tetrachloride (d) carbonyl chloride

42.Which of the following reagents is used to detect the aldehyde group? (a) Ninhydrin reagent (b) Tollen’s reagent (c) Grignard reagent (d) Baeyer’s reagent

43.Terylene is a (a) addition polymer (b) condensation polymer (c) polyamide (d) polyimide

44.The formula of Zinc blende is (a) ZnCO3ZnCO_3ZnCO3​ (b) ZnS (c) ZnO (d) ZnO.Fe2O3ZnO.Fe_2O_3ZnO.Fe2​O3​

45.The oxidation state of iron in Mohr’s salt is (a) +2 (b) +3 (c) +1 (d) 0

46.Which of the following oxides is acidic? (a) FeO (b) CO2CO_2CO2​ (c) CO (d) CaO

47.The structure of ammonia molecule is (a) V-shaped (b) tetrahedral (c) linear (d) trigonal pyramidal

48.Orthophosphoric acid is (a) monobasic acid (b) dibasic acid (c) Tribasic acid (d) tetrabasic acid

49.The formula of Epsom salt is (a) MgSO4.7H2OMgSO_4.7H_2OMgSO4​.7H2​O (b) MgO (c) CuSO4.2H2OCuSO_4.2H_2OCuSO4​.2H2​O (d) CaO

50.Ostwald’s process is used for the manufacture of (a) Sulphuric acid (b) nitric acid (c) ammonia (d) white phosphorus

51.Among the following elements, the one having highest electron affinity is (a) chlorine (b) fluorine (c) iodine (d) bromine

53.Equivalent weight of potassium dichromate in acidic medium is equal to (a) Mol. wt/1 (b) Mol. wt/6 (c) Mol. wt/3 (d) Mol. wt/5

54.Which of the following is the unit of surface tension? (a) dynes.cm (b) dyne.cm−1dyne.cm^{-1}dyne.cm−1 (c) dyne.cm2dyne.cm^2dyne.cm2 (d) dyne.cm−2dyne.cm^{-2}dyne.cm−2

55.Electrons will distribute themselves in degenerate orbitals so as to retain parallel spin as much as possible. This is called (a) Hund’s rule (b) Aufbau principle (c) Uncertainty principle (d) Paul’s exclusion principle

56.If the pH of a solution is 5.2, the hydrogen ion concentration of the solution is (a) 6.3×10−56.3 \times 10^{-5}6.3×10−5 M (b) 6.3×10−66.3 \times 10^{-6}6.3×10−6 M (c) 6.3×10−76.3 \times 10^{-7}6.3×10−7 M (d) 6.3×10−46.3 \times 10^{-4}6.3×10−4 M

57.The enthalpy of formation of the compound is (a) always positive (b) always negative (c) can be positive or negative (d) unpredictable

58.The gas obtained by adding water on aluminum carbide is (a) Ethyne (b) ethane (c) methane (d) ethane

59.The mixture of HCl and ZnCl2ZnCl_2ZnCl2​ is known as (a) Tollen's reagent (b) Baeyer's reagent (c) Lucas reagent (d) Nessler's reagent

60.The IUPAC name of n-valeric acid is (a) Pentanoic acid (b) butanoic acid (c) Propanoic acid (d) ethanoic acid

61.A blood red coloration of ferric sulphocyanide obtained by addition of ferric chloride in sodium extract confirms the presence of (a) Sulphur (b) nitrogen (c) both a and b (d) halogens

62.The compound that undergoes Cannizzaro reaction is (a) CH3COOHCH_3COOHCH3​COOH (b) C2H5CHOC_2H_5CHOC2​H5​CHO (c) HCHO (d) CH3OCH3CH_3OCH_3CH3​OCH3​

63.Benzene is converted to toluene by (a) Friedel Craft reaction (b) Grignard reaction (c) Wurtz reaction (d) Perkin reaction

64.The compound that gives positive carbylamine reaction is (a) (CH3)2NH(CH_3)_2NH(CH3​)2​NH (b) (CH3)3N(CH_3)_3N(CH3​)3​N (c) (CH3)4N+(CH_3)_4N^+(CH3​)4​N+ (d) (CH3)NH2(CH_3)NH_2(CH3​)NH2​

65.Zinc sulphate (ZnSO4.7H2OZnSO_4.7H_2OZnSO4​.7H2​O) is also called (a) White vitriol (b) Green vitriol (c) Blue vitriol (d) corrosive sublimate

66.Brass is an alloy of (a) Copper and Zinc (b) Copper and Nickel (c) Copper and Tin (d) Copper and Lead

67.The formula of dolomite is (a) CaCO3CaCO_3CaCO3​ (b) CaCO3.MgCO3CaCO_3.MgCO_3CaCO3​.MgCO3​ (c) CaSO4.2H2OCaSO_4.2H_2OCaSO4​.2H2​O (d) CaF2CaF_2CaF2​

68.The general electronic configuration of zinc is (a) [Ar]4s23d10[Ar]4s^23d^{10}[Ar]4s23d10 (b) [Ar]4s13d10[Ar]4s^13d^{10}[Ar]4s13d10 (c) [Ar]4s23d8[Ar]4s^23d^8[Ar]4s23d8 (d) [Ar]4s23d7[Ar]4s^23d^7[Ar]4s23d7

69.Equivalent weight of KMnO4KMnO_4KMnO4​ in neutral medium is (a) 52.6 (b) 158.0 (c) 31.6 (d) 63.0

70.Bohr's model was modified by (a) Rutherford (b) Somerfield (c) Dalton (d) Pauli

71.How many Oxygen atoms are there in 8.0 g of oxygen atoms? (a) 3.011×10233.011\times10^{23}3.011×1023 atoms (b) 3.011×10223.011\times10^{22}3.011×1022 atoms (c) 3.011×10203.011\times10^{20}3.011×1020 atoms (d) 3.011×10193.011\times10^{19}3.011×1019 atoms

72.What is the pH of 0.001 M HCl? (a) 2.0 (b) 3.0 (c) 4.0 (d) 5.0

73.The CGS unit of specific conductance is (a) Siemen cm−1^{-1}−1 (b) ohm−1^{-1}−1cm2^22equiv−1^{-1}−1 (c) Siemen (d) ohm−1^{-1}−1

74.Hess's law deals with (a) Total change in heat of reaction (b) Rate of reaction (c) Equilibrium constant of reaction (d) Influence on pressure of volume of gas

75.The degree of dissociation of an electrolyte (a) Decreases with dilution (b) Increases with dilution (c) May increase or decrease with dilution (d) Is not affected by dilution

76.The weight of 100 ml of NH3NH_3NH3​ gas at NTP is (a) 0.0759 g (b) 0.0579 g (c) 0.0459 g (d) 0.0359 g

77.The law of multiple proportions was given by (a) Richter (b) John Dalton (c) Albert Einstein (d) Gay Lussac

78.How many orbitals are possible for principle quantum number 3? (a) 3 (b) 4 (c) 6 (d) 9

79.The half-life of an radioisotope is 30 minutes. After how much time the amount of radioisotope left is 1/4th of the original amount? (a) 4 minutes (b) 30 minutes (c) 60 minutes (d) 120 minutes

80.What is oxidation of chlorine in HOCl? (a) +1 (b) 0 (c) -1 (d) +3

81.Hemoglobin contains 0.33% iron by weight. Molecular weight of hemoglobin is 67200. The number of iron atoms (At wt of Fe = 55.85) in one molecule of hemoglobin is (a) 2 (b) 4 (c) 6 (d) 8

The unit of rate constant for first order reaction is (a) $sec^{-1}$ (b) $mol\ sec^{-1}$ (c) $mol\ sec^{-1}$ (d) $litre\ mol^{-2} s^{-1}$

The unit of rate constant for first order reaction is (a) $mol\ s^{-1}$ (b) $L\ mol^{-2}s^{-1}$ (c) $s^{-1}$ (d) $mol\ L^{-1}s^{-1}$

The unit of rate constant for first order reaction is (a) $Sec^{-1}$ (b) $mol\ Sec^{-1}$ (c) $mol^{-1}\ Sec^{-1}$ (d) $liter^2\ mol^{-2}\ S^{-1}$

The unit of rate constant for third order reaction is (a) $S^{-1}$ (b) $mol^{-2}L^2S^{-1}$ (c) $mol^{-1}LS^{-1}$ (d) $mol\ L^{-1}S^{-1}$

The unit of first order rate constant is (a) $time^{-1}conc^{-1}$ (b) $time\ conc^{-1}$ (c) $conc.time^{-1}$ (d) $time^{-1}$

$Na_2O$ is a (a) Neutral oxide (b) acidic oxide (c) Basic oxide (d) amphoteric oxide

Which of the following elements has highest electron affinity? (a) chlorine (b) bromine (c) iodine (d) fluorine

MgO is an example of (a) basic oxide (b) amphoteric oxide (c) neutral oxide (d) acidic oxide

PbO is an example of (a) amphoteric oxide (b) neutral Oxide (c) acidic Oxide (d) basic Oxide

The weight of sodium carbonate required to prepare 100 mL of Deci normal sodium carbonate solution is (a) 0.53 gm (b) 5.3 gm (c) 0.353 gm (d) 5.6 gm

The actual electronic configuration of copper is (a) $[Ar]4s^2 3d^8$ (b) $[Ar]4s^1 3d^{10}$ (c) $[Ar]4s^2 3d^{10}$ (d) $[Ar]4s^2 3d^8$

Which of the following compounds has highest boiling point? (a) $CH_4$ (b) $CH_3Cl$ (c) $CH_3Br$ (d) $CH_3OH$

Hematite is an ore of (a) Silver (b) Iron (c) Mercury (d) Copper

Which of the following elements has highest electronegativity? (a) Bromine (b) Iodine (c) Chlorine (d) Fluorine

The rate of reaction is independent of (a) Temperature (b) concentration (c) Particle size of reactant (d) Molecularity

The number of moles of water present in 18g of water is (a) 18 (b) 1 (c) 1.8 (d) 180

In which of the following compound the molecular geometry cannot be predicted by the use of VSEPR theory? (a) $C_2H_6$ (b) $H_2O$ (c) $CH_4$ (d) $NH_3$

Ammonia is manufactured by the use of (a) Solvay's process (b) Haber's process (c) Ostwald's process (d) Down's process

Penicillin is an example of (a) Antiseptic drug (b) Antipyretic drug (c) Antibiotic drug (d) Analgesic drug

The number of moles present in 90 g of water is (a) 1.0 (b) 90.0 (c) 5.0 (d) 9.0

The molecular geometry of which compound cannot be predicted by the application of VSEPR theory? (a) $CH_4$ (b) $PCl_5$ (c) $SF_6$ (d) $MgCl_2$

Ammonia is manufactured by the use of (a) Down's Process (b) Solvay's Process (c) Haber's Process (d) Ostwald's Process

Dettol is an example of (a) analgesic drug (b) antipyretic drug (c) antibiotic drug (d) antiseptic drug

Which of the following halogens has highest electron affinity? (a) fluorine (b) iodine (c) bromine (d) chlorine

Each carbon atom in benzene is (a) $sp^2$ hybridized (b) $sp$ hybridized (c) $sp^3$ hybridized (d) $sp^3d$ hybridized

Each carbon atom of benzene is (a) $sp^2$ hybridized (b) $sp^3$ hybridized (c) $sp$ hybridized (d) $sp^2d$ hybridized

Hematite is an ore of (a) Iron (b) Copper (c) Mercury (d) Silver

The Shape of $SF_6$ molecule based on VSEPR theory is (a) linear (b) square planar (c) octahedral (d) trigonal bipyramidal

The rate of reaction is independent of (a) Molecularity (b) temperature (c) particle size of reactant (d) concentration of reactants

The weight of sodium carbonate required to prepare 1000 mL of its Deci normal solution is (a) 0.53 g (b) 5.3 g (c) 0.053 g (d) 5.6 g

Picric acid is obtained by the nitration of (a) aniline (b) phenol (c) benzene (d) benzoic acid

The actual electronic configuration of copper is (a) $[Ar]3d^94s^2$ (b) $[Ar]3d^{10}4s^1$ (c) $[Ar]3d^84s^2$ (d) $[Ar]3d^74s^2$

The Shape of $PCl_5$ molecule based on VSEPR theory is (a) Octahedral (b) trigonal bipyramidal (c) trigonal planar (d) Pentagonal bipyramidal

Which of the following acid has highest boiling point? (a) $HCOOH$ (b) $CH_3COOH$ (c) $C_2H_5COOH$ (d) $C_3H_7COOH$

Picric acid is obtained by the nitration of (a) aniline (b) benzene (c) phenol (d) benzoic acid

Paraffins are also called (a) alkanes (b) alkenes (c) alkynes (d) ethylenes

$Al_4C_3$ reacts with water to give (a) $C_2H_4$ (b) $C_2H_2$ (c) $H_2$ (d) $CH_4$

Aniline on warming with Benzaldehyde (a) acetanilide (b) benzalinide (c) Schiff’s base (d) phenol

Which of the following compounds is used as the best anti-knocking agent? (a) Tetraethyl lead (b) methane (c) methoxy propane (d) methyl cyanide

Chloroform reacts with concentrated $HNO_3$ on heating and yields (a) chloretone (b) chloropicrin (c) carbon tetrachloride (d) carbonyl chloride

Which of the following reagents is used to detect the aldehyde group? (a) Ninhydrin reagent (b) Tollen’s reagent (c) Grignard reagent (d) Baeyer’s reagent

Terylene is a (a) addition polymer (b) condensation polymer (c) polyamide (d) polyimide

The formula of Zinc blende is (a) $ZnCO_3$ (b) ZnS (c) ZnO (d) $ZnO.Fe_2O_3$

The oxidation state of iron in Mohr’s salt is (a) +2 (b) +3 (c) +1 (d) 0

Which of the following oxides is acidic? (a) FeO (b) $CO_2$ (c) CO (d) CaO

The structure of ammonia molecule is (a) V-shaped (b) tetrahedral (c) linear (d) trigonal pyramidal

Orthophosphoric acid is (a) monobasic acid (b) dibasic acid (c) Tribasic acid (d) tetrabasic acid

The formula of Epsom salt is (a) $MgSO_4.7H_2O$ (b) MgO (c) $CuSO_4.2H_2O$ (d) CaO

Ostwald’s process is used for the manufacture of (a) Sulphuric acid (b) nitric acid (c) ammonia (d) white phosphorus

Among the following elements, the one having highest electron affinity is (a) chlorine (b) fluorine (c) iodine (d) bromine

Equivalent weight of potassium dichromate in acidic medium is equal to (a) Mol. wt/1 (b) Mol. wt/6 (c) Mol. wt/3 (d) Mol. wt/5

Which of the following is the unit of surface tension? (a) dynes.cm (b) $dyne.cm^{-1}$ (c) $dyne.cm^2$ (d) $dyne.cm^{-2}$

Electrons will distribute themselves in degenerate orbitals so as to retain parallel spin as much as possible. This is called (a) Hund’s rule (b) Aufbau principle (c) Uncertainty principle (d) Paul’s exclusion principle

If the pH of a solution is 5.2, the hydrogen ion concentration of the solution is (a) $6.3 \times 10^{-5}$ M (b) $6.3 \times 10^{-6}$ M (c) $6.3 \times 10^{-7}$ M (d) $6.3 \times 10^{-4}$ M

The enthalpy of formation of the compound is (a) always positive (b) always negative (c) can be positive or negative (d) unpredictable

The gas obtained by adding water on aluminum carbide is (a) Ethyne (b) ethane (c) methane (d) ethane

The mixture of HCl and $ZnCl_2$ is known as (a) Tollen's reagent (b) Baeyer's reagent (c) Lucas reagent (d) Nessler's reagent

The IUPAC name of n-valeric acid is (a) Pentanoic acid (b) butanoic acid (c) Propanoic acid (d) ethanoic acid

A blood red coloration of ferric sulphocyanide obtained by addition of ferric chloride in sodium extract confirms the presence of (a) Sulphur (b) nitrogen (c) both a and b (d) halogens

The compound that undergoes Cannizzaro reaction is (a) $CH_3COOH$ (b) $C_2H_5CHO$ (c) HCHO (d) $CH_3OCH_3$

Benzene is converted to toluene by (a) Friedel Craft reaction (b) Grignard reaction (c) Wurtz reaction (d) Perkin reaction

The compound that gives positive carbylamine reaction is (a) $(CH_3)_2NH$ (b) $(CH_3)_3N$ (c) $(CH_3)_4N^+$ (d) $(CH_3)NH_2$

Zinc sulphate ( $ZnSO_4.7H_2O$ ) is also called (a) White vitriol (b) Green vitriol (c) Blue vitriol (d) corrosive sublimate

Brass is an alloy of (a) Copper and Zinc (b) Copper and Nickel (c) Copper and Tin (d) Copper and Lead

The formula of dolomite is (a) $CaCO_3$ (b) $CaCO_3.MgCO_3$ (c) $CaSO_4.2H_2O$ (d) $CaF_2$

The general electronic configuration of zinc is (a) $[Ar]4s^23d^{10}$ (b) $[Ar]4s^13d^{10}$ (c) $[Ar]4s^23d^8$ (d) $[Ar]4s^23d^7$

Equivalent weight of $KMnO_4$ in neutral medium is (a) 52.6 (b) 158.0 (c) 31.6 (d) 63.0

Bohr's model was modified by (a) Rutherford (b) Somerfield (c) Dalton (d) Pauli

How many Oxygen atoms are there in 8.0 g of oxygen atoms? (a) $3.011\times10^{23}$ atoms (b) $3.011\times10^{22}$ atoms (c) $3.011\times10^{20}$ atoms (d) $3.011\times10^{19}$ atoms

What is the pH of 0.001 M HCl? (a) 2.0 (b) 3.0 (c) 4.0 (d) 5.0

The CGS unit of specific conductance is (a) Siemen cm $^{-1}$ (b) ohm $^{-1}$ cm $^2$ equiv $^{-1}$ (c) Siemen (d) ohm $^{-1}$

Hess's law deals with (a) Total change in heat of reaction (b) Rate of reaction (c) Equilibrium constant of reaction (d) Influence on pressure of volume of gas

The degree of dissociation of an electrolyte (a) Decreases with dilution (b) Increases with dilution (c) May increase or decrease with dilution (d) Is not affected by dilution

The weight of 100 ml of $NH_3$ gas at NTP is (a) 0.0759 g (b) 0.0579 g (c) 0.0459 g (d) 0.0359 g

The law of multiple proportions was given by (a) Richter (b) John Dalton (c) Albert Einstein (d) Gay Lussac

How many orbitals are possible for principle quantum number 3? (a) 3 (b) 4 (c) 6 (d) 9

The half-life of an radioisotope is 30 minutes. After how much time the amount of radioisotope left is 1/4th of the original amount? (a) 4 minutes (b) 30 minutes (c) 60 minutes (d) 120 minutes

What is oxidation of chlorine in HOCl? (a) +1 (b) 0 (c) -1 (d) +3

Hemoglobin contains 0.33% iron by weight. Molecular weight of hemoglobin is 67200. The number of iron atoms (At wt of Fe = 55.85) in one molecule of hemoglobin is (a) 2 (b) 4 (c) 6 (d) 8

The gas law which deals with the effect of pressure in a given volume of gas at constant temperature is known as (a) Boyle's Law (b) Charles's Law (c) Graham's Law (d) Dalton's Law