Chapter 4

Chemistry

+2 college entrance (after SEE) past exam questions

Past questions and answers

74 questions set from this chapter. Most repeated first.

2083 · Science Practice Set A · 1 mark

Mg(S)+ $\mathrm{H_{2}SO_{4}}$ (aq) ⎯⎯⎯→ $\mathrm{MgSO_{4}}$ (aq)+ $\mathrm{H_{2}}$ (g). This reaction is an example of a: (a) Combination reaction (b) Decomposition reaction (c) Single displacement reaction (d) Neutralization reaction

Similar questions: mathrmH_2SO_4(aq) + CaO(S) ⎯⎯→ mathrmCaSO_4(aq)+ (2083 · Science Practice Set C)

Answer

(c) Single displacement reaction

Magnesium is more reactive than hydrogen, so it displaces hydrogen from sulphuric acid to form magnesium sulphate.

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2083 · Science Practice Set C · 1 mark

$\mathrm{H_{2}SO_{4}}$ (aq) + CaO(S) ⎯⎯→ $\mathrm{CaSO_{4}}$ (aq)+ $\mathrm{H_{2}O}$ (l). This reaction is an example of : (a) Combination reaction (b) Decomposition reaction (c) Displacement (d) Neutralization reaction

Similar questions: Mg(S)+ mathrmH_2SO_4(aq) ⎯⎯⎯→ mathrmMgSO_4(aq)+ (2083 · Science Practice Set A)

Answer

(d) Neutralization reaction

The acid $\mathrm{H_2SO_4}$ reacts with the basic oxide CaO to give a salt ( $\mathrm{CaSO_4}$ ) and water.

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2083 · Science Practice Set A · 1 mark

An element X has valency equal to 2. What will be the formula of x with sulphate ions? (a) $\mathrm{X_{2}SO_{4}}$ (b) $\mathrm{XSO_{4}}$ (c) $\mathrm{X_{2}(SO_{4})_{3}}$ (d) $\mathrm{X(SO_{4})_{3}}$

Answer

(b) $\mathrm{XSO_4}$

X has valency 2 (ion $X^{2+}$ ) and sulphate $SO_4^{2-}$ also has valency 2. The charges balance in a 1:1 ratio, giving $\mathrm{XSO_4}$ .

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2083 · Science Practice Set A · 1 mark

The electronic configuration of aluminum ion (Al ) is: +3 (a) 2,8,1 (b) 2,8,2 (c) 2,8 (d) 2,8,4

Answer

(c) 2,8

Aluminium (Z = 13) has configuration 2,8,3. Losing three electrons to form $Al^{3+}$ leaves 10 electrons, so the configuration is 2,8.

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2083 · Science Practice Set A · 1 mark

The rate of chemical reaction influenced by which one of the following factors? (a) Temperature (b) Concentration of reactant (c) Using catalyst (d) All of them

Answer

(d) All of them

Temperature, reactant concentration and a catalyst each change the rate of a reaction, so all three factors influence it.

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2083 · Science Practice Set A · 1 mark

A students mixed together aqueous solution of X and Y. A curdy white precipitate (solid) is formed. Solution X and Y are: (a) Barium chloride & dil. sulfuric acid (b) sodium hydroxide & sodium chloride (c) Calcium carbonate & Hydrochloric acid (d) Hydrochloric acid & calcium sulphate

Answer

(a) Barium chloride & dil. sulfuric acid

$\mathrm{BaCl_2 + H_2SO_4 \rightarrow BaSO_4\downarrow + 2HCl}$

Barium sulphate is insoluble and appears as a white precipitate. The other pairs either do not react or give no precipitate.

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2083 · Science Practice Set A · 1 mark

Which of the following colors is indicated by methyl-orange in acidic medium? (a) Pink (b) Blue (c) Green (d) Red

Answer

(d) Red

Methyl orange is red in acidic medium and yellow in basic medium.

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2083 · Science Practice Set A · 1 mark

Carbon dioxide gas is produced when marble chips is reacted with: (a) Dil. HCl (b) conc. HCl (c) dil. $\mathrm{H_{2}SO_{4}}$ (d) $\mathrm{HNO_{3}}$

Answer

(a) Dil. HCl

$\mathrm{CaCO_3 + 2HCl \rightarrow CaCl_2 + H_2O + CO_2\uparrow}$

Marble is calcium carbonate. Dilute sulphuric acid forms an insoluble $\mathrm{CaSO_4}$ layer that soon stops the reaction, so dilute HCl is the usual choice.

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2083 · Science Practice Set A · 1 mark

Which one of the following gases is basic in nature? (a) Carbon dioxide (b) Ammonia (c) $\mathrm{SO_{2}}$ (d) $\mathrm{H_{2}S}$

Answer

(b) Ammonia

$\mathrm{NH_3}$ dissolves in water to give $\mathrm{NH_4OH}$ , which turns red litmus blue. $\mathrm{CO_2}$ , $\mathrm{SO_2}$ and $\mathrm{H_2S}$ are acidic.

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2083 · Science Practice Set A · 1 mark

The important ore from which silver metal can be extracted is: (a) Hematite (b) Bauxite (c) Chalcocite (d) Horn silver

Answer

(d) Horn silver

Horn silver is silver chloride, $\mathrm{AgCl}$ , an important ore of silver. Hematite is an ore of iron, bauxite of aluminium and chalcocite of copper.

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2083 · Science Practice Set A · 1 mark

Read the following two statements i and ii, select one of the correct statements: i. Metal are good conductor of heat and electricity. ii. Generally metals are electropositive. (a) Statement i is correct. (b) Statement i and ii are correct. (c) Statement ii is correct. (d) Statement i and ii are incorrect.

Answer

(b) Statement i and ii are correct.

Metals conduct heat and electricity well because of free electrons. They tend to lose electrons to form positive ions, so they are electropositive.

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2083 · Science Practice Set A · 1 mark

Which of the following formulae represents the diethyl ether? (a) $\mathrm{C_{3}H_{8}O}$ (b) $\mathrm{C_{4}H_{10}O}$ (c) $\mathrm{C_{4}H_{10}O_{2}}$ (d) $\mathrm{C_{3}H_{10}O}$

Answer

(b) $\mathrm{C_4H_{10}O}$

Diethyl ether is $\mathrm{C_2H_5{-}O{-}C_2H_5}$ , which has 4 C, 10 H and 1 O.

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2083 · Science Practice Set A · 1 mark

Trihydric alcohol (Glycerin) has a molecular formula: (a) $\mathrm{CH_{3}CH_{2}CH_{2}OH}$ (b) $\mathrm{C_{3}H_{10}O}$ (c) $\mathrm{C_{3}H_{5}(OH)_{3}}$ (d) $\mathrm{C_{3}H_{8}O}$ .

Answer

(c) $\mathrm{C_3H_5(OH)_3}$

Glycerin (propane-1,2,3-triol) has three $-\mathrm{OH}$ groups, one on each carbon, so it is trihydric.

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2083 · Science Practice Set A · 1 mark

Which of the following formulae represents the alkene? (a) CnHn (b) CnH2n (c) CnH2n+1 (d) CnH2n+2

Answer

(b) $\mathrm{C_nH_{2n}}$

Alkenes have one C=C double bond, giving the general formula $\mathrm{C_nH_{2n}}$ . Alkanes are $\mathrm{C_nH_{2n+2}}$ .

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2083 · Science Practice Set A · 1 mark

What is the molecular formula of urea? (a) $\mathrm{(NH_{4})_{2}NO_{3}}$ (b) $\mathrm{CO(NH_{2})_{2}}$ (c) $\mathrm{CH_{3}COOH}$ (d) $\mathrm{(NH_{4})_{2}SO_{4}}$

Answer

(b) $\mathrm{CO(NH_2)_2}$

Urea is the amide of carbonic acid, with one C=O group joined to two $-\mathrm{NH_2}$ groups. It is a widely used nitrogenous fertilizer.

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2083 · Science Practice Set A · 1 mark

Which one of the following pairs are not allotropes? (a) Ortho and para Hydrogen (b) Oxygen and ozone (c) Yellow and Red phosphorous (d) Nascent and atomic Hydrogen

Answer

(d) Nascent and atomic Hydrogen

Nascent hydrogen is simply freshly produced atomic hydrogen, so they are the same species, not allotropes. The other pairs are different forms of the same element: ortho/para hydrogen, $\mathrm{O_2}$ / $\mathrm{O_3}$ , and yellow/red phosphorus.

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2083 · Science Practice Set B · 1 mark

The electronic configuration of Calcium ion (Ca ++) is (a) 2,8,5 (b) 2,8,8 (c) 2,8,4 (d) 2,8,7

Answer

(b) 2,8,8

Calcium (Z = 20) has configuration 2,8,8,2. Ca²⁺ loses its two outermost electrons, giving 2,8,8.

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2083 · Science Practice Set B · 1 mark

An element X has a valency 3. What will be its formula with carbonate ion? (a) $\mathrm{X_{2}(CO_{3})_{3}}$ (b) $\mathrm{X_{2}CO_{3}}$ (c) $\mathrm{XCO_{3}}$ (d) $\mathrm{X(CO_{3})_{3}}$

Answer

(a) $\mathrm{X_{2}(CO_{3})_{3}}$

Carbonate is $\mathrm{CO_3^{2-}}$ (valency 2) and X has valency 3. Criss-crossing the valencies gives $\mathrm{X_2(CO_3)_3}$ .

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2083 · Science Practice Set B · 1 mark

In presence of heat the following reaction occurs, $\mathrm{CaCO_{3}}$ ⎯⎯⎯→ CaO + $\mathrm{CO_{2}}$ . This reaction is an example of (a) Combination reaction (b) Displacement reaction (c) Double displacement reaction (d) Decomposition reaction

Answer

(d) Decomposition reaction

A single compound, $\mathrm{CaCO_3}$ , breaks down on heating into two simpler substances, CaO and $\mathrm{CO_2}$ .

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2083 · Science Practice Set B · 1 mark

Haber's process is used for the (a) Manufacture of $\mathrm{H_{2}SO_{4}}$ (b) Manufacture of $\mathrm{CO_{2}}$ (c) Manufacture of $\mathrm{NH_{3}}$ (d) Manufacture of $\mathrm{HNO_{3}}$

Answer

(c) Manufacture of $\mathrm{NH_{3}}$

Haber's process combines nitrogen and hydrogen: $\mathrm{N_2 + 3H_2 \rightleftharpoons 2NH_3}$ , using an iron catalyst.

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2083 · Science Practice Set B · 1 mark

In the salt, NaCl, which one of the statements is correct? (a) Na+ is basic radical & Cl - is acid radical. (b) Na+ is Acid radical & Cl - is basic radical. (c) Both Na+ and Cl- are acid radical. (d) Both Na+ and Cl- are basic radical.

Answer

(a) Na⁺ is basic radical & Cl⁻ is acid radical.

The positive ion $\mathrm{Na^+}$ comes from the base NaOH (basic radical), and the negative ion $\mathrm{Cl^-}$ comes from the acid HCl (acid radical).

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2083 · Science Practice Set B · 1 mark

Among the following, which one is NOT an indicator? (a) Litmus paper (b) Phenolphthalein (c) Methyl orange (d) Methyl alcohol

Answer

(d) Methyl alcohol

Litmus, phenolphthalein and methyl orange change colour with acids and bases, so they are indicators. Methyl alcohol does not.

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2083 · Science Practice Set B · 1 mark

Industrially, urea gas is prepared by: (a) Reacting $\mathrm{CO_{2}}$ and HCl (b) Reacting $\mathrm{CaCO_{3}}$ and $\mathrm{H_{2}SO_{4}}$ (c) Reacting $\mathrm{CO_{2}}$ and $\mathrm{NH_{3}}$ (d) By heating $\mathrm{NH_{4}NO_{3}}$ at very high temperature

Answer

(c) Reacting $\mathrm{CO_2}$ and $\mathrm{NH_3}$

Urea is made industrially (Bosch–Meiser process) by heating ammonia with carbon dioxide under high pressure (about 150–200 atm, 180–200 °C): $2NH_3 + CO_2 \rightarrow NH_2COONH_4 \rightarrow NH_2CONH_2 + H_2O$ .

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2083 · Science Practice Set B · 1 mark

……………. gas is used as a coolant in refrigerator & air condenser. (a) $\mathrm{CO_{2}}$ (b) $\mathrm{NH_{3}}$ (c) $\mathrm{H_{2}}$ (d) $\mathrm{O_{2}}$

Answer

(b) $\mathrm{NH_3}$

Ammonia is easily liquefied under pressure and absorbs a large amount of latent heat when it evaporates, so liquid ammonia is used as the coolant in refrigerators and air conditioners.

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2083 · Science Practice Set B · 1 mark

The important ore of iron is: (a) Haematite (b) Chalcocite (c) Silver copper glance (d) Both A & B

Answer

(a) Haematite

Haematite, $\mathrm{Fe_2O_3}$ , is the chief ore of iron. Chalcocite ( $\mathrm{Cu_2S}$ ) is an ore of copper and silver copper glance is an ore of silver, so "both A & B" is wrong.

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2083 · Science Practice Set B · 1 mark

In Aqua-regia the ratio of mixture of conc. hydrochloric acid and conc. nitric acid is: (a) 1:3 ratio (b) 3:1 ratio (c) 1:1 ratio (d) 3:3 ratio

Answer

(b) 3:1 ratio

Aqua regia is a mixture of three parts conc. HCl and one part conc. $\mathrm{HNO_3}$ by volume. It dissolves noble metals such as gold and platinum.

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2083 · Science Practice Set B · 1 mark

Unsaturated hydrocarbons that is alkene can be represented by a formula: (a) CnH2n (b) CnH2n+2 (c) CnH2n4 (d) C2nH2n+2

Answer

(a) $\mathrm{C_nH_{2n}}$

Alkenes contain one carbon–carbon double bond and have the general formula $\mathrm{C_nH_{2n}}$ . $\mathrm{C_nH_{2n+2}}$ is the formula for alkanes.

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2083 · Science Practice Set B · 1 mark

The functional group of aldehydes is: (a) – OH (b) – O – (c) – CHO (d) – $\mathrm{NH_{2}}$

Answer

(c) $-\mathrm{CHO}$

The aldehyde group is a carbonyl group joined to a hydrogen atom, $-\mathrm{CHO}$ . $-OH$ is alcohol, $-O-$ is ether and $-NH_2$ is amine.

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2083 · Science Practice Set B · 1 mark

The Violet colored glass can be prepared by mixing: (a) $\mathrm{Cu_{2}O}$ (b) $\mathrm{MnO_{2}}$ (c) NiO (d) $\mathrm{Fe_{2}O_{3}}$

Answer

(b) $\mathrm{MnO_2}$

Manganese dioxide gives violet (purple) colour to glass. $\mathrm{Cu_2O}$ gives red, NiO gives brown/grey-violet shades and $\mathrm{Fe_2O_3}$ gives yellow/brown.

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2083 · Science Practice Set B · 1 mark

The percentage of lead in pencil is: (a) 50% (b) 20% (c) 10% (d) 0%

Answer

(d) 0%

Pencil "lead" is not lead at all. It is a mixture of graphite (a form of carbon) and clay, so the percentage of lead is zero.

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2083 · Science Practice Set B · 1 mark

Protium and Deuterium are: (a) Isotones of Hydrogen (b) Allotropes of Hydrogen (c) Isotopes of Hydrogen (d) Isobars of Hydrogen

Answer

(c) Isotopes of Hydrogen

Protium ( $^1_1H$ ) and deuterium ( $^2_1H$ ) have the same atomic number (1) but different mass numbers (1 and 2), so they are isotopes.

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2083 · Science Practice Set C · 1 mark

The electronic configuration of phosphorus is: (a) 2,8,3 (b) 2,8,4 (c) 2,8,5 (d) 2,8,6

Answer

(c) 2,8,5

Phosphorus has atomic number 15, so the 15 electrons are arranged as 2, 8, 5.

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2083 · Science Practice Set C · 1 mark

The metal M forms a salt with Nitrate ion is $\mathrm{M(NO_{3})}$ . The Valency of metal is: (a) 1 (b) 2 (c) 3 (d) 4

Answer

(a) 1

The nitrate ion is $\mathrm{NO_3^-}$ (valency 1). In $\mathrm{M(NO_3)}$ one nitrate balances one metal ion, so the valency of M is 1.

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2083 · Science Practice Set C · 1 mark

In the following reaction 240° c 2KClO3 ⎯⎯⎯⎯⎯→ 2KCl + 3O2 $\mathrm{MnO_{2}}$ Manganese dioxide $\mathrm{(MnO_{2})}$ act as : (a) Positive catalyst (b) Negative catalyst (c) Auto catalyst (d) Induced Catalyst

Answer

(a) Positive catalyst

$\mathrm{MnO_2}$ speeds up the decomposition of $\mathrm{KClO_3}$ without being consumed, so it is a positive catalyst.

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2083 · Science Practice Set C · 1 mark

What happens when dilute hydrochloric acid is added to marble chips? (a) Produce $\mathrm{CO_{2}}$ , $\mathrm{H_{2}O}$ and CaCl. (b) Produce $\mathrm{CO_{2}}$ , $\mathrm{H_{2}O}$ and $\mathrm{CaCl_{2}}$ . (c) Produce $\mathrm{CO_{2}}$ , $\mathrm{H_{2}O}$ and $\mathrm{CaCl_{3}}$ (d) Produce CO, $\mathrm{H_{2}O}$ and $\mathrm{CaCl_{2}}$

Answer

(b) Produce $\mathrm{CO_2}$ , $\mathrm{H_2O}$ and $\mathrm{CaCl_2}$

$\mathrm{CaCO_3+2HCl\to CaCl_2+H_2O+CO_2\uparrow}$

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2083 · Science Practice Set C · 1 mark

Which of the following colours is indicated by phenolphthalein in acidic medium? (a) Blue (b) Red (c) Pink (d) Colourless

Answer

(d) Colourless

Phenolphthalein is colourless in acidic (and neutral) medium and turns pink in basic medium.

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2083 · Science Practice Set C · 1 mark

Which of the following gases can change the colour of wet red litmus paper? (a) Hydrogen (b) Oxygen (c) Ammonia (d) Carbondioxide

Answer

(c) Ammonia

Ammonia dissolves in the moisture to form $\mathrm{NH_4OH}$ , a base, which turns red litmus blue.

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2083 · Science Practice Set C · 1 mark

Which one of the following statements is not correct for an acid? (a) Acid gives off hydrogen ion(H+) in solution. (b) Acid has a sour taste. (c) Acid produces salt and water with base. (d) Acid produces oxygen gas when react with metal like Mg, Zn, etc.

Answer

(d) Acid produces oxygen gas when react with metal like Mg, Zn, etc.

This statement is incorrect: acids react with active metals to release hydrogen gas, e.g. $\mathrm{Zn+H_2SO_4\to ZnSO_4+H_2\uparrow}$ .

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2083 · Science Practice Set C · 1 mark

The important ore of iron is. (a) Bauxite (b) Chalcopyrite (c) Magnetite (d) Argentite

Answer

(c) Magnetite

Magnetite ( $\mathrm{Fe_3O_4}$ ) is an important iron ore. Bauxite is an ore of aluminium, chalcopyrite of copper and argentite of silver.

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2083 · Science Practice Set C · 1 mark

Which of the following statements is not correct? (a) Water and air have no effect on gold. (b) Gold is used to prepare gold leaf electroscope. (c) Gold is active metal. (d) Gold dissolve in aqua regia.

Answer

(c) Gold is active metal.

This is not correct: gold is a very unreactive (noble) metal, unaffected by air and water, and it dissolves only in aqua regia.

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2083 · Science Practice Set C · 1 mark

Which of the following are members of the same homologous series? (a) $\mathrm{CH_{4}}$ & $\mathrm{C_{2}H_{4}}$ (b) $\mathrm{CH_{3}Cl}$ & $\mathrm{C_{2}H_{5}OH}$ (c) $\mathrm{C_{2}H_{5}OH}$ & $\mathrm{C_{3}H_{7}OH}$ (d) $\mathrm{CH_{3}OCH_{3}}$ & $\mathrm{C_{2}H_{5}OH}$

Answer

(c) $\mathrm{C_2H_5OH}$ & $\mathrm{C_3H_7OH}$

Both are alcohols (same functional group $-\mathrm{OH}$ ) differing by one $-\mathrm{CH_2}-$ unit, so they belong to the same homologous series.

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2083 · Science Practice Set C · 1 mark

Which of the following formulae represents the Butane? (a) $\mathrm{C_{2}H_{6}}$ (b) $\mathrm{C_{3}H_{8}}$ (c) $\mathrm{C_{4}H_{10}}$ (d) $\mathrm{C_{4}H_{12}}$

Answer

(c) $\mathrm{C_4H_{10}}$

Butane is an alkane with 4 carbons, so $\mathrm{C_nH_{2n+2}}=\mathrm{C_4H_{10}}$ .

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2083 · Science Practice Set C · 1 mark

Cement is the mixture of : (a) Calcium silicate and Calcium aluminate (b) Calcium silicate and Calcium chloride (c) Calcium carbonate and Calcium suphate (d) Calcium chloride and Calcium aluminate

Answer

(a) Calcium silicate and Calcium aluminate

Cement mainly consists of calcium silicates and calcium aluminates, formed by heating limestone and clay.

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2083 · Science Practice Set C · 1 mark

Soap is a ____________ salt of fatty acid. (a) Sodium or Potassium (b) Calcium (c) Magnesium (d) Aluminium

Answer

(a) Sodium or Potassium

Soap is the sodium or potassium salt of a long-chain fatty acid, e.g. sodium stearate.

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2083 · Science Practice Set C · 1 mark

Diamond and Graprite are the ____________ carbon. (a) Isotopes (b) Allotropes (c) Isobars (d) Isotones

Answer

(b) Allotropes

Diamond and graphite are different physical forms of the same element, carbon, which are called allotropes.

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2083 · Science Practice Set D · 1 mark

The electronic configuration of sodium ion is (a) 2,8,1 (b) 2,8 (c) 2, 8,2 (d) 2,8,4

Answer

(b) 2,8

Sodium (Z = 11) has configuration 2,8,1. It loses its one outer electron to form $\mathrm{Na^+}$ , giving 2,8.

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2083 · Science Practice Set D · 1 mark

An element R has valency equals to 2. What will be its formula with phosphate ion? (a) $\mathrm{RPO_{4}}$ (b) $\mathrm{R_{2}PO_{4}}$ (c) $\mathrm{R_{3}(PO_{4})_{2}}$ (d) $\mathrm{R(PO_{4})_{2}}$

Answer

(c) $\mathrm{R_{3}(PO_{4})_{2}}$

$R$ has valency 2 and phosphate $\mathrm{PO_4^{3-}}$ has valency 3. Criss-crossing the valencies gives $\mathrm{R_3(PO_4)_2}$ .

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2083 · Science Practice Set D · 1 mark

C + $\mathrm{O_{2}}$ ⎯⎯⎯→ $\mathrm{CO_{2}}$ + Heat. This reaction is an example of (a) Exothermic reaction (b) Endothermic reaction (c) Endo and exothermic reaction (d) Photochemical reaction

Answer

(a) Exothermic reaction

Heat is released as a product, so the reaction is exothermic.

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2083 · Science Practice Set D · 1 mark

One mole of oxygen gas contains how many gas molecules? (a) $6.023 \times 10^{20}$ (b) $6.023 \times 10^{21}$ (c) $6.023 \times 10^{23}$ (d) $6.023 \times 10^{24}$

Answer

(c) $6.023 \times 10^{23}$

One mole of any substance contains Avogadro's number of particles, $6.023\times10^{23}$ molecules.

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2083 · Science Practice Set D · 1 mark

Atomic mass of carbon is 12 amu but 1 amu is equal to (a) $1.66 \times 10^{-20}$ gm (b) $1.66 \times 10^{-22}$ gm (c) $1.66 \times 10^{-24}$ gm (d) $1.66 \times 10^{-23}$ gm

Answer

(c) $1.66 \times 10^{-24}$ gm

$1\ \text{amu}=\dfrac{1}{12}$ of the mass of a C-12 atom $=\dfrac{12/(6.023\times10^{23})}{12}=1.66\times10^{-24}$ g.

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2083 · Science Practice Set D · 1 mark

Which one of the following statements is correct for basic radical? (a) Basic radical contains –ve charge. (b) Basic radical is obtained from Acid. (c) Basic radical is +ve charge particals obtained from base (d) Basic radical is Blue in colour

Answer

(c) Basic radical is +ve charged particles obtained from base

A basic radical is the positively charged part (cation) of a compound, such as $\mathrm{Na^+}$ or $\mathrm{Ca^{2+}}$ , formed when a base or salt ionises. It is not negatively charged, nor obtained from an acid, and it has no characteristic colour.

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2083 · Science Practice Set D · 1 mark

The correct molecular formula of baking soda is (a) $\mathrm{Na_{2}CO_{3}}$ (b) $\mathrm{NaHCO_{3}}$ (c) $\mathrm{Na_{2}CO_{3}}$ .10H2O (d) $\mathrm{NaCO_{3}}$

Answer

(b) $\mathrm{NaHCO_{3}}$

Baking soda is sodium bicarbonate (sodium hydrogen carbonate). $\mathrm{Na_2CO_3}$ is soda ash and $\mathrm{Na_2CO_3\cdot 10H_2O}$ is washing soda.

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2083 · Science Practice Set D · 1 mark

phenolphthalein indicator becomes pink in (a) Acidic medium (b) Neutral medium (c) Alkaline medium (d) Salt solution

Answer

(c) Alkaline medium

Phenolphthalein is colourless in acidic and neutral solutions and turns pink in alkaline (basic) solutions.

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2083 · Science Practice Set D · 1 mark

Which gas turns moist blue litmus paper red and produce white precipitate when bubbled through calcium hydroxide solution? (a) Carbon monoxide (b) Carbon dioxide (c) Ammonia (d) Hydrogen chloride

Answer

(b) Carbon dioxide

$\mathrm{CO_2}$ dissolves in moisture to form weak carbonic acid, which turns blue litmus red. With lime water it gives a white precipitate: $\mathrm{Ca(OH)_2 + CO_2 \rightarrow CaCO_3\downarrow + H_2O}$ .

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2083 · Science Practice Set D · 1 mark

Iron is extracted from (a) Haematite (b) Bauxite (c) Felspar (d) Chalcopyrite

Answer

(a) Haematite

Haematite ( $\mathrm{Fe_2O_3}$ ) is the main ore of iron. Bauxite is the ore of aluminium, felspar is an aluminosilicate mineral, and chalcopyrite is an ore of copper.

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2083 · Science Practice Set D · 1 mark

Which of the following pairs are the member of the same homologous series? (a) $\mathrm{CH_{4}}$ & $\mathrm{C_{2}H_{4}}$ (b) $\mathrm{CH_{3}OH}$ & $\mathrm{CH_{3}Cl}$ (c) $\mathrm{C_{2}H_{5}OH}$ & $\mathrm{C_{3}H_{7}OH}$ (d) $\mathrm{CH_{3}OCH_{3}}$ & $\mathrm{C_{2}H_{5}OH}$

Answer

(c) $\mathrm{C_{2}H_{5}OH}$ & $\mathrm{C_{3}H_{7}OH}$

Both are alcohols with the same functional group $-\mathrm{OH}$ and differ by one $-\mathrm{CH_2}-$ unit, so they belong to the same homologous series.

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2083 · Science Practice Set D · 1 mark

Which of the following is used for the preparation of high-quality toilet soaps & cosmetics goods? (a) Methyl alcohol (b) Glycerol (c) Ethyl alcohol (d) Ether

Answer

(b) Glycerol

Glycerol is a by-product of soap making. Its moisturising and softening properties make it useful in high-quality toilet soaps and cosmetics.

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2083 · Science Practice Set D · 1 mark

Cement is the mixture of (a) Calcium carbonate and calcium chloride (b) Calcium silicate and calcium aluminate (c) Calcium sulphate & sodium chloride (d) Calcium oxide & carbon

Answer

(b) Calcium silicate and calcium aluminate

Cement is mainly a mixture of calcium silicates (tri- and dicalcium silicate) and calcium aluminates, which set and harden when water is added.

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2083 · Science Practice Set D · 1 mark

Ordinary glass is also called as (a) Hard glass (b) Boro–silicate glass (c) Soft glass (d) Lead crystal glass

Answer

(c) Soft glass

Ordinary glass (soda-lime glass) is made from sodium silicate and calcium silicate. It softens at a low temperature, hence it is called soft glass.

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2083 · Science Practice Set D · 1 mark

Chemicals used to control the harmful insects are called (a) Chemical fertilizer (b) Insecticides (c) Fertilizers (d) Pesticides

Answer

(b) Insecticides

Insecticides are chemicals that kill harmful insects. Pesticides is the broader term covering all pest-killing chemicals, including insecticides, fungicides and herbicides.

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2011 · Science Entrance Sample Paper · 1 mark

Which of the following forms a colloidal solution in water? (a) Glucose (b) Starch (c) Sodium Chloride (d) Urea

Answer

(b) Starch

Starch has very large molecules that form a colloidal solution in water. Glucose, sodium chloride and urea form true solutions.

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2011 · Science Entrance Sample Paper · 1 mark

A compound was found to contain nitrogen and oxygen in the ratio 28 : 64. The formula of the compound is (a) $\mathrm{NO}$ (b) $\mathrm{N_2O_3}$ (c) $\mathrm{N_2O_4}$ (d) $\mathrm{N_2O_5}$

Answer

(c) $\mathrm{N_2O_4}$

Moles: $\text{N}=28/14=2$ , $\text{O}=64/16=4$ , so the ratio is $2:4$ and the formula is $\mathrm{N_2O_4}$ .

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2011 · Science Entrance Sample Paper · 1 mark

Chemical formula of a particular compounds reflects (a) Shape of its molecule (b) Size of its molecule (c) Total number of atoms in a molecule (d) Number of different types of atoms in a molecule

Answer

(d) Number of different types of atoms in a molecule

A formula shows which elements are present and how many atoms of each. It does not tell the shape or size of the molecule.

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2011 · Science Entrance Sample Paper · 1 mark

Electronic configuration of $\mathrm{M^{2+}}$ ion is 2, 8, 14 and its atomic weight is 56 amu. The number of neutrons in its nucleus are (a) 30 (b) 32 (c) 34 (d) 42

Answer

(a) 30

$\mathrm{M^{2+}}$ has $2+8+14=24$ electrons, so the neutral atom has 26 electrons, giving $Z=26$ . Neutrons $=56-26=30$ .

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2011 · Science Entrance Sample Paper · 1 mark

Atoms combine in a small whole number ratio, this concept was proposed by (a) Dalton (b) Avogadro (c) Gay Lussac (d) Berzelius

Answer

(a) Dalton

Dalton's atomic theory states that atoms combine in small whole-number ratios to form compounds.

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2011 · Science Entrance Sample Paper · 1 mark

Two substance P and Q combine to give a third substance R. The process is exothermic and R has properties different from those of P and Q. Is the substance R (a) An element (b) A mixture (c) A compound (d) An atom

Answer

(c) A compound

Two substances combining chemically with heat released, to give a product with new properties, form a compound. A mixture would keep the properties of its components.

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2011 · Science Entrance Sample Paper · 1 mark

Which of the following is called Sylvine? (a) KCl (b) NaCl (c) $\mathrm{CaCl_2}$ (d) $\mathrm{MgCl_2}$

Answer

(a) KCl

Sylvine (sylvite) is the mineral form of potassium chloride, KCl.

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2011 · Science Entrance Sample Paper · 1 mark

Liquid silver is (a) Ag (b) Mg (c) Hg (d) none

Answer

(c) Hg

Mercury is called quicksilver, the liquid silver-coloured metal, symbol Hg.

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2011 · Science Entrance Sample Paper · 1 mark

The general formula of Paraffin is (a) $\mathrm{C_nH_{2n+1}\cdot X}$ (b) $\mathrm{C_nH_{2n}}$ (c) $\mathrm{C_nH_{2n-2}}$ (d) $\mathrm{C_nH_{2n+2}}$

Answer

(d) $\mathrm{C_nH_{2n+2}}$

Paraffins are the saturated hydrocarbons (alkanes), with general formula $\mathrm{C_nH_{2n+2}}$ .

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2011 · Science Entrance Sample Paper · 1 mark

In IUPAC system of nomenclature, 'But' in hydrocarbon indicates (a) Prefix (b) Word root (c) Primary suffix (d) Secondary suffix

Answer

(b) Word root

In IUPAC names the word root gives the number of carbon atoms in the longest chain: "Meth-" (1), "Eth-" (2), "Prop-" (3), "But-" (4). So "But" in butane indicates a chain of four carbons.

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2011 · Science Entrance Sample Paper · 1 mark

Which of the following reactions is an acid-base reaction? (a) $\mathrm{BaCl_2 + H_2SO_4 \to BaSO_4 + 2HCl}$ (b) $\mathrm{NaCl + AgNO_3 \to AgCl + NaNO_3}$ (c) $\mathrm{HCl + NaOH \to NaCl + H_2O}$ (d) $\mathrm{FeCl_3 + NaOH \to NaCl + Fe(OH)_3}$

Answer

(c) $\mathrm{HCl + NaOH \to NaCl + H_2O}$

An acid (HCl) reacts with a base (NaOH) to give salt and water, which is neutralisation. The others are precipitation or double-decomposition reactions between salts.

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2011 · Science Entrance Sample Paper · 1 mark

You are given a mixture of sand and common salt. Which process should apply to get pure common salt? (a) Dissolution and Evaporation (b) Evaporation and Crystallization (c) Evaporation and Sublimation (d) Sublimation and Crystallization

Answer

(a) Dissolution and Evaporation

Common salt dissolves in water but sand does not. Dissolve the mixture in water, filter off the sand, then evaporate the filtrate to get pure salt.

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2011 · Science Entrance Sample Paper · 1 mark

Two isotonic elements X and Y have atomic masses 54 and 56 respectively. If atomic number of X is 26, the atomic number of Y will be (a) 26 (b) 27 (c) 28 (d) 30

Answer

(c) 28

Isotones have the same number of neutrons. For X: $n = 54 - 26 = 28$ . For Y: $Z = 56 - 28 = 28$ .

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2011 · Science Entrance Sample Paper · 1 mark

German silver is an alloy of (a) Fe, Cr, Ni (b) Cu, Zn, Ag (c) Cu, Zn, Ni (d) Cu, Sn, Al

Answer

(c) Cu, Zn, Ni

German silver (nickel silver) is an alloy of copper, zinc and nickel. It contains no silver.

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Questions from Trinity International College Practice Questions for +2 Entrance Exam, Management Set A (College-published practice booklet (April 2026) for the +2 Management entrance: 100 MCQs in English, Mathematics and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Management Set B (College-published practice booklet (April 2026) for the +2 Management entrance: 100 MCQs in English, Mathematics and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Management Set C (College-published practice booklet (April 2026) for the +2 Management entrance: 100 MCQs in English, Mathematics and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Science Set A (College-published practice booklet (April 2026) for the +2 Science entrance: 100 MCQs in Physics, Chemistry, Biology, Mathematics, English and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Science Set B (College-published practice booklet (April 2026) for the +2 Science entrance: 100 MCQs in Physics, Chemistry, Biology, Mathematics, English and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Science Set C (College-published practice booklet (April 2026) for the +2 Science entrance: 100 MCQs in Physics, Chemistry, Biology, Mathematics, English and General Knowledge; practice paper, not a recalled board paper), Trinity International College Practice Questions for +2 Entrance Exam, Science Set D (College-published practice booklet (April 2026) for the +2 Science entrance: 100 MCQs in Physics, Chemistry, Biology, Mathematics, English and General Knowledge; practice paper, not a recalled board paper) and Trinity International College Entrance Test 2011, +2 Science (sample test paper) (College sample test paper for the +2 Science entrance, 100 MCQs (Science 50, Mathematics 20, English 20, General Knowledge 10), 2011). Answers are written for this site; check them against your class notes.

Past questions and answers

1.Mg(S)+ H2SO4\mathrm{H_{2}SO_{4}}H2​SO4​(aq) ⎯⎯⎯→ MgSO4\mathrm{MgSO_{4}}MgSO4​(aq)+ H2\mathrm{H_{2}}H2​(g). This reaction is an example of a: (a) Combination reaction (b) Decomposition reaction (c) Single displacement reaction (d) Neutralization reaction

2.H2SO4\mathrm{H_{2}SO_{4}}H2​SO4​(aq) + CaO(S) ⎯⎯→ CaSO4\mathrm{CaSO_{4}}CaSO4​(aq)+ H2O\mathrm{H_{2}O}H2​O (l). This reaction is an example of : (a) Combination reaction (b) Decomposition reaction (c) Displacement (d) Neutralization reaction

3.An element X has valency equal to 2. What will be the formula of x with sulphate ions? (a) X2SO4\mathrm{X_{2}SO_{4}}X2​SO4​ (b) XSO4\mathrm{XSO_{4}}XSO4​ (c) X2(SO4)3\mathrm{X_{2}(SO_{4})_{3}}X2​(SO4​)3​ (d) X(SO4)3\mathrm{X(SO_{4})_{3}}X(SO4​)3​

4.The electronic configuration of aluminum ion (Al ) is: +3 (a) 2,8,1 (b) 2,8,2 (c) 2,8 (d) 2,8,4

5.The rate of chemical reaction influenced by which one of the following factors? (a) Temperature (b) Concentration of reactant (c) Using catalyst (d) All of them

6.A students mixed together aqueous solution of X and Y. A curdy white precipitate (solid) is formed. Solution X and Y are: (a) Barium chloride & dil. sulfuric acid (b) sodium hydroxide & sodium chloride (c) Calcium carbonate & Hydrochloric acid (d) Hydrochloric acid & calcium sulphate

7.Which of the following colors is indicated by methyl-orange in acidic medium? (a) Pink (b) Blue (c) Green (d) Red

8.Carbon dioxide gas is produced when marble chips is reacted with: (a) Dil. HCl (b) conc. HCl (c) dil. H2SO4\mathrm{H_{2}SO_{4}}H2​SO4​ (d) HNO3\mathrm{HNO_{3}}HNO3​

9.Which one of the following gases is basic in nature? (a) Carbon dioxide (b) Ammonia (c) SO2\mathrm{SO_{2}}SO2​ (d) H2S\mathrm{H_{2}S}H2​S

10.The important ore from which silver metal can be extracted is: (a) Hematite (b) Bauxite (c) Chalcocite (d) Horn silver

12.Which of the following formulae represents the diethyl ether? (a) C3H8O\mathrm{C_{3}H_{8}O}C3​H8​O (b) C4H10O\mathrm{C_{4}H_{10}O}C4​H10​O (c) C4H10O2\mathrm{C_{4}H_{10}O_{2}}C4​H10​O2​ (d) C3H10O\mathrm{C_{3}H_{10}O}C3​H10​O

13.Trihydric alcohol (Glycerin) has a molecular formula: (a) CH3CH2CH2OH\mathrm{CH_{3}CH_{2}CH_{2}OH}CH3​CH2​CH2​OH (b) C3H10O\mathrm{C_{3}H_{10}O}C3​H10​O (c) C3H5(OH)3\mathrm{C_{3}H_{5}(OH)_{3}}C3​H5​(OH)3​ (d) C3H8O\mathrm{C_{3}H_{8}O}C3​H8​O.

14.Which of the following formulae represents the alkene? (a) CnHn (b) CnH2n (c) CnH2n+1 (d) CnH2n+2

15.What is the molecular formula of urea? (a) (NH4)2NO3\mathrm{(NH_{4})_{2}NO_{3}}(NH4​)2​NO3​ (b) CO(NH2)2\mathrm{CO(NH_{2})_{2}}CO(NH2​)2​ (c) CH3COOH\mathrm{CH_{3}COOH}CH3​COOH (d) (NH4)2SO4\mathrm{(NH_{4})_{2}SO_{4}}(NH4​)2​SO4​

16.Which one of the following pairs are not allotropes? (a) Ortho and para Hydrogen (b) Oxygen and ozone (c) Yellow and Red phosphorous (d) Nascent and atomic Hydrogen

17.The electronic configuration of Calcium ion (Ca ++) is (a) 2,8,5 (b) 2,8,8 (c) 2,8,4 (d) 2,8,7

18.An element X has a valency 3. What will be its formula with carbonate ion? (a) X2(CO3)3\mathrm{X_{2}(CO_{3})_{3}}X2​(CO3​)3​ (b) X2CO3\mathrm{X_{2}CO_{3}}X2​CO3​ (c) XCO3\mathrm{XCO_{3}}XCO3​ (d) X(CO3)3\mathrm{X(CO_{3})_{3}}X(CO3​)3​

19.In presence of heat the following reaction occurs, CaCO3\mathrm{CaCO_{3}}CaCO3​⎯⎯⎯→ CaO + CO2\mathrm{CO_{2}}CO2​. This reaction is an example of (a) Combination reaction (b) Displacement reaction (c) Double displacement reaction (d) Decomposition reaction

20.Haber's process is used for the (a) Manufacture of H2SO4\mathrm{H_{2}SO_{4}}H2​SO4​ (b) Manufacture of CO2\mathrm{CO_{2}}CO2​ (c) Manufacture of NH3\mathrm{NH_{3}}NH3​ (d) Manufacture of HNO3\mathrm{HNO_{3}}HNO3​

21.In the salt, NaCl, which one of the statements is correct? (a) Na+ is basic radical & Cl - is acid radical. (b) Na+ is Acid radical & Cl - is basic radical. (c) Both Na+ and Cl- are acid radical. (d) Both Na+ and Cl- are basic radical.

22.Among the following, which one is NOT an indicator? (a) Litmus paper (b) Phenolphthalein (c) Methyl orange (d) Methyl alcohol

24.……………. gas is used as a coolant in refrigerator & air condenser. (a) CO2\mathrm{CO_{2}}CO2​ (b) NH3\mathrm{NH_{3}}NH3​ (c) H2\mathrm{H_{2}}H2​ (d) O2\mathrm{O_{2}}O2​

25.The important ore of iron is: (a) Haematite (b) Chalcocite (c) Silver copper glance (d) Both A & B

26.In Aqua-regia the ratio of mixture of conc. hydrochloric acid and conc. nitric acid is: (a) 1:3 ratio (b) 3:1 ratio (c) 1:1 ratio (d) 3:3 ratio

27.Unsaturated hydrocarbons that is alkene can be represented by a formula: (a) CnH2n (b) CnH2n+2 (c) CnH2n4 (d) C2nH2n+2

28.The functional group of aldehydes is: (a) – OH (b) – O – (c) – CHO (d) – NH2\mathrm{NH_{2}}NH2​

29.The Violet colored glass can be prepared by mixing: (a) Cu2O\mathrm{Cu_{2}O}Cu2​O (b) MnO2\mathrm{MnO_{2}}MnO2​ (c) NiO (d) Fe2O3\mathrm{Fe_{2}O_{3}}Fe2​O3​

30.The percentage of lead in pencil is: (a) 50% (b) 20% (c) 10% (d) 0%

31.Protium and Deuterium are: (a) Isotones of Hydrogen (b) Allotropes of Hydrogen (c) Isotopes of Hydrogen (d) Isobars of Hydrogen

32.The electronic configuration of phosphorus is: (a) 2,8,3 (b) 2,8,4 (c) 2,8,5 (d) 2,8,6

33.The metal M forms a salt with Nitrate ion is M(NO3)\mathrm{M(NO_{3})}M(NO3​). The Valency of metal is: (a) 1 (b) 2 (c) 3 (d) 4

34.In the following reaction 240° c 2KClO3 ⎯⎯⎯⎯⎯→ 2KCl + 3O2 MnO2\mathrm{MnO_{2}}MnO2​ Manganese dioxide (MnO2)\mathrm{(MnO_{2})}(MnO2​) act as : (a) Positive catalyst (b) Negative catalyst (c) Auto catalyst (d) Induced Catalyst

36.Which of the following colours is indicated by phenolphthalein in acidic medium? (a) Blue (b) Red (c) Pink (d) Colourless

37.Which of the following gases can change the colour of wet red litmus paper? (a) Hydrogen (b) Oxygen (c) Ammonia (d) Carbondioxide

38.Which one of the following statements is not correct for an acid? (a) Acid gives off hydrogen ion(H+) in solution. (b) Acid has a sour taste. (c) Acid produces salt and water with base. (d) Acid produces oxygen gas when react with metal like Mg, Zn, etc.

39.The important ore of iron is. (a) Bauxite (b) Chalcopyrite (c) Magnetite (d) Argentite

40.Which of the following statements is not correct? (a) Water and air have no effect on gold. (b) Gold is used to prepare gold leaf electroscope. (c) Gold is active metal. (d) Gold dissolve in aqua regia.

42.Which of the following formulae represents the Butane? (a) C2H6\mathrm{C_{2}H_{6}}C2​H6​ (b) C3H8\mathrm{C_{3}H_{8}}C3​H8​ (c) C4H10\mathrm{C_{4}H_{10}}C4​H10​ (d) C4H12\mathrm{C_{4}H_{12}}C4​H12​

43.Cement is the mixture of : (a) Calcium silicate and Calcium aluminate (b) Calcium silicate and Calcium chloride (c) Calcium carbonate and Calcium suphate (d) Calcium chloride and Calcium aluminate

44.Soap is a ____________ salt of fatty acid. (a) Sodium or Potassium (b) Calcium (c) Magnesium (d) Aluminium

45.Diamond and Graprite are the ____________ carbon. (a) Isotopes (b) Allotropes (c) Isobars (d) Isotones

46.The electronic configuration of sodium ion is (a) 2,8,1 (b) 2,8 (c) 2, 8,2 (d) 2,8,4

47.An element R has valency equals to 2. What will be its formula with phosphate ion? (a) RPO4\mathrm{RPO_{4}}RPO4​ (b) R2PO4\mathrm{R_{2}PO_{4}}R2​PO4​ (c) R3(PO4)2\mathrm{R_{3}(PO_{4})_{2}}R3​(PO4​)2​ (d) R(PO4)2\mathrm{R(PO_{4})_{2}}R(PO4​)2​

48.C + O2\mathrm{O_{2}}O2​ ⎯⎯⎯→ CO2\mathrm{CO_{2}}CO2​ + Heat. This reaction is an example of (a) Exothermic reaction (b) Endothermic reaction (c) Endo and exothermic reaction (d) Photochemical reaction

49.One mole of oxygen gas contains how many gas molecules? (a) 6.023×10206.023 \times 10^{20}6.023×1020 (b) 6.023×10216.023 \times 10^{21}6.023×1021 (c) 6.023×10236.023 \times 10^{23}6.023×1023 (d) 6.023×10246.023 \times 10^{24}6.023×1024

50.Atomic mass of carbon is 12 amu but 1 amu is equal to (a) 1.66×10−201.66 \times 10^{-20}1.66×10−20 gm (b) 1.66×10−221.66 \times 10^{-22}1.66×10−22 gm (c) 1.66×10−241.66 \times 10^{-24}1.66×10−24 gm (d) 1.66×10−231.66 \times 10^{-23}1.66×10−23 gm

51.Which one of the following statements is correct for basic radical? (a) Basic radical contains –ve charge. (b) Basic radical is obtained from Acid. (c) Basic radical is +ve charge particals obtained from base (d) Basic radical is Blue in colour

52.The correct molecular formula of baking soda is (a) Na2CO3\mathrm{Na_{2}CO_{3}}Na2​CO3​ (b) NaHCO3\mathrm{NaHCO_{3}}NaHCO3​ (c) Na2CO3\mathrm{Na_{2}CO_{3}}Na2​CO3​.10H2O (d) NaCO3\mathrm{NaCO_{3}}NaCO3​

53.phenolphthalein indicator becomes pink in (a) Acidic medium (b) Neutral medium (c) Alkaline medium (d) Salt solution

54.Which gas turns moist blue litmus paper red and produce white precipitate when bubbled through calcium hydroxide solution? (a) Carbon monoxide (b) Carbon dioxide (c) Ammonia (d) Hydrogen chloride

55.Iron is extracted from (a) Haematite (b) Bauxite (c) Felspar (d) Chalcopyrite

57.Which of the following is used for the preparation of high-quality toilet soaps & cosmetics goods? (a) Methyl alcohol (b) Glycerol (c) Ethyl alcohol (d) Ether

58.Cement is the mixture of (a) Calcium carbonate and calcium chloride (b) Calcium silicate and calcium aluminate (c) Calcium sulphate & sodium chloride (d) Calcium oxide & carbon

59.Ordinary glass is also called as (a) Hard glass (b) Boro–silicate glass (c) Soft glass (d) Lead crystal glass

60.Chemicals used to control the harmful insects are called (a) Chemical fertilizer (b) Insecticides (c) Fertilizers (d) Pesticides

61.Which of the following forms a colloidal solution in water? (a) Glucose (b) Starch (c) Sodium Chloride (d) Urea

62.A compound was found to contain nitrogen and oxygen in the ratio 28 : 64. The formula of the compound is (a) NO\mathrm{NO}NO (b) N2O3\mathrm{N_2O_3}N2​O3​ (c) N2O4\mathrm{N_2O_4}N2​O4​ (d) N2O5\mathrm{N_2O_5}N2​O5​

63.Chemical formula of a particular compounds reflects (a) Shape of its molecule (b) Size of its molecule (c) Total number of atoms in a molecule (d) Number of different types of atoms in a molecule

64.Electronic configuration of M2+\mathrm{M^{2+}}M2+ ion is 2, 8, 14 and its atomic weight is 56 amu. The number of neutrons in its nucleus are (a) 30 (b) 32 (c) 34 (d) 42

65.Atoms combine in a small whole number ratio, this concept was proposed by (a) Dalton (b) Avogadro (c) Gay Lussac (d) Berzelius

66.Two substance P and Q combine to give a third substance R. The process is exothermic and R has properties different from those of P and Q. Is the substance R (a) An element (b) A mixture (c) A compound (d) An atom

67.Which of the following is called Sylvine? (a) KCl (b) NaCl (c) CaCl2\mathrm{CaCl_2}CaCl2​ (d) MgCl2\mathrm{MgCl_2}MgCl2​

68.Liquid silver is (a) Ag (b) Mg (c) Hg (d) none

69.The general formula of Paraffin is (a) CnH2n+1⋅X\mathrm{C_nH_{2n+1}\cdot X}Cn​H2n+1​⋅X (b) CnH2n\mathrm{C_nH_{2n}}Cn​H2n​ (c) CnH2n−2\mathrm{C_nH_{2n-2}}Cn​H2n−2​ (d) CnH2n+2\mathrm{C_nH_{2n+2}}Cn​H2n+2​

70.In IUPAC system of nomenclature, 'But' in hydrocarbon indicates (a) Prefix (b) Word root (c) Primary suffix (d) Secondary suffix

72.You are given a mixture of sand and common salt. Which process should apply to get pure common salt? (a) Dissolution and Evaporation (b) Evaporation and Crystallization (c) Evaporation and Sublimation (d) Sublimation and Crystallization

73.Two isotonic elements X and Y have atomic masses 54 and 56 respectively. If atomic number of X is 26, the atomic number of Y will be (a) 26 (b) 27 (c) 28 (d) 30

74.German silver is an alloy of (a) Fe, Cr, Ni (b) Cu, Zn, Ag (c) Cu, Zn, Ni (d) Cu, Sn, Al

Mg(S)+ $\mathrm{H_{2}SO_{4}}$ (aq) ⎯⎯⎯→ $\mathrm{MgSO_{4}}$ (aq)+ $\mathrm{H_{2}}$ (g). This reaction is an example of a: (a) Combination reaction (b) Decomposition reaction (c) Single displacement reaction (d) Neutralization reaction

$\mathrm{H_{2}SO_{4}}$ (aq) + CaO(S) ⎯⎯→ $\mathrm{CaSO_{4}}$ (aq)+ $\mathrm{H_{2}O}$ (l). This reaction is an example of : (a) Combination reaction (b) Decomposition reaction (c) Displacement (d) Neutralization reaction

An element X has valency equal to 2. What will be the formula of x with sulphate ions? (a) $\mathrm{X_{2}SO_{4}}$ (b) $\mathrm{XSO_{4}}$ (c) $\mathrm{X_{2}(SO_{4})_{3}}$ (d) $\mathrm{X(SO_{4})_{3}}$

The electronic configuration of aluminum ion (Al ) is: +3 (a) 2,8,1 (b) 2,8,2 (c) 2,8 (d) 2,8,4

The rate of chemical reaction influenced by which one of the following factors? (a) Temperature (b) Concentration of reactant (c) Using catalyst (d) All of them

A students mixed together aqueous solution of X and Y. A curdy white precipitate (solid) is formed. Solution X and Y are: (a) Barium chloride & dil. sulfuric acid (b) sodium hydroxide & sodium chloride (c) Calcium carbonate & Hydrochloric acid (d) Hydrochloric acid & calcium sulphate

Which of the following colors is indicated by methyl-orange in acidic medium? (a) Pink (b) Blue (c) Green (d) Red

Carbon dioxide gas is produced when marble chips is reacted with: (a) Dil. HCl (b) conc. HCl (c) dil. $\mathrm{H_{2}SO_{4}}$ (d) $\mathrm{HNO_{3}}$

Which one of the following gases is basic in nature? (a) Carbon dioxide (b) Ammonia (c) $\mathrm{SO_{2}}$ (d) $\mathrm{H_{2}S}$

The important ore from which silver metal can be extracted is: (a) Hematite (b) Bauxite (c) Chalcocite (d) Horn silver

Which of the following formulae represents the diethyl ether? (a) $\mathrm{C_{3}H_{8}O}$ (b) $\mathrm{C_{4}H_{10}O}$ (c) $\mathrm{C_{4}H_{10}O_{2}}$ (d) $\mathrm{C_{3}H_{10}O}$

Trihydric alcohol (Glycerin) has a molecular formula: (a) $\mathrm{CH_{3}CH_{2}CH_{2}OH}$ (b) $\mathrm{C_{3}H_{10}O}$ (c) $\mathrm{C_{3}H_{5}(OH)_{3}}$ (d) $\mathrm{C_{3}H_{8}O}$ .

Which of the following formulae represents the alkene? (a) CnHn (b) CnH2n (c) CnH2n+1 (d) CnH2n+2

What is the molecular formula of urea? (a) $\mathrm{(NH_{4})_{2}NO_{3}}$ (b) $\mathrm{CO(NH_{2})_{2}}$ (c) $\mathrm{CH_{3}COOH}$ (d) $\mathrm{(NH_{4})_{2}SO_{4}}$

Which one of the following pairs are not allotropes? (a) Ortho and para Hydrogen (b) Oxygen and ozone (c) Yellow and Red phosphorous (d) Nascent and atomic Hydrogen

The electronic configuration of Calcium ion (Ca ++) is (a) 2,8,5 (b) 2,8,8 (c) 2,8,4 (d) 2,8,7

An element X has a valency 3. What will be its formula with carbonate ion? (a) $\mathrm{X_{2}(CO_{3})_{3}}$ (b) $\mathrm{X_{2}CO_{3}}$ (c) $\mathrm{XCO_{3}}$ (d) $\mathrm{X(CO_{3})_{3}}$

In presence of heat the following reaction occurs, $\mathrm{CaCO_{3}}$ ⎯⎯⎯→ CaO + $\mathrm{CO_{2}}$ . This reaction is an example of (a) Combination reaction (b) Displacement reaction (c) Double displacement reaction (d) Decomposition reaction

Haber's process is used for the (a) Manufacture of $\mathrm{H_{2}SO_{4}}$ (b) Manufacture of $\mathrm{CO_{2}}$ (c) Manufacture of $\mathrm{NH_{3}}$ (d) Manufacture of $\mathrm{HNO_{3}}$

In the salt, NaCl, which one of the statements is correct? (a) Na+ is basic radical & Cl - is acid radical. (b) Na+ is Acid radical & Cl - is basic radical. (c) Both Na+ and Cl- are acid radical. (d) Both Na+ and Cl- are basic radical.

Among the following, which one is NOT an indicator? (a) Litmus paper (b) Phenolphthalein (c) Methyl orange (d) Methyl alcohol

……………. gas is used as a coolant in refrigerator & air condenser. (a) $\mathrm{CO_{2}}$ (b) $\mathrm{NH_{3}}$ (c) $\mathrm{H_{2}}$ (d) $\mathrm{O_{2}}$

The important ore of iron is: (a) Haematite (b) Chalcocite (c) Silver copper glance (d) Both A & B

In Aqua-regia the ratio of mixture of conc. hydrochloric acid and conc. nitric acid is: (a) 1:3 ratio (b) 3:1 ratio (c) 1:1 ratio (d) 3:3 ratio

Unsaturated hydrocarbons that is alkene can be represented by a formula: (a) CnH2n (b) CnH2n+2 (c) CnH2n4 (d) C2nH2n+2

The functional group of aldehydes is: (a) – OH (b) – O – (c) – CHO (d) – $\mathrm{NH_{2}}$

The Violet colored glass can be prepared by mixing: (a) $\mathrm{Cu_{2}O}$ (b) $\mathrm{MnO_{2}}$ (c) NiO (d) $\mathrm{Fe_{2}O_{3}}$

The percentage of lead in pencil is: (a) 50% (b) 20% (c) 10% (d) 0%

Protium and Deuterium are: (a) Isotones of Hydrogen (b) Allotropes of Hydrogen (c) Isotopes of Hydrogen (d) Isobars of Hydrogen

The electronic configuration of phosphorus is: (a) 2,8,3 (b) 2,8,4 (c) 2,8,5 (d) 2,8,6

The metal M forms a salt with Nitrate ion is $\mathrm{M(NO_{3})}$ . The Valency of metal is: (a) 1 (b) 2 (c) 3 (d) 4

In the following reaction 240° c 2KClO3 ⎯⎯⎯⎯⎯→ 2KCl + 3O2 $\mathrm{MnO_{2}}$ Manganese dioxide $\mathrm{(MnO_{2})}$ act as : (a) Positive catalyst (b) Negative catalyst (c) Auto catalyst (d) Induced Catalyst

Which of the following colours is indicated by phenolphthalein in acidic medium? (a) Blue (b) Red (c) Pink (d) Colourless

Which of the following gases can change the colour of wet red litmus paper? (a) Hydrogen (b) Oxygen (c) Ammonia (d) Carbondioxide

Which one of the following statements is not correct for an acid? (a) Acid gives off hydrogen ion(H+) in solution. (b) Acid has a sour taste. (c) Acid produces salt and water with base. (d) Acid produces oxygen gas when react with metal like Mg, Zn, etc.

The important ore of iron is. (a) Bauxite (b) Chalcopyrite (c) Magnetite (d) Argentite

Which of the following statements is not correct? (a) Water and air have no effect on gold. (b) Gold is used to prepare gold leaf electroscope. (c) Gold is active metal. (d) Gold dissolve in aqua regia.

Which of the following formulae represents the Butane? (a) $\mathrm{C_{2}H_{6}}$ (b) $\mathrm{C_{3}H_{8}}$ (c) $\mathrm{C_{4}H_{10}}$ (d) $\mathrm{C_{4}H_{12}}$

Cement is the mixture of : (a) Calcium silicate and Calcium aluminate (b) Calcium silicate and Calcium chloride (c) Calcium carbonate and Calcium suphate (d) Calcium chloride and Calcium aluminate

Soap is a ____________ salt of fatty acid. (a) Sodium or Potassium (b) Calcium (c) Magnesium (d) Aluminium

Diamond and Graprite are the ____________ carbon. (a) Isotopes (b) Allotropes (c) Isobars (d) Isotones

The electronic configuration of sodium ion is (a) 2,8,1 (b) 2,8 (c) 2, 8,2 (d) 2,8,4

An element R has valency equals to 2. What will be its formula with phosphate ion? (a) $\mathrm{RPO_{4}}$ (b) $\mathrm{R_{2}PO_{4}}$ (c) $\mathrm{R_{3}(PO_{4})_{2}}$ (d) $\mathrm{R(PO_{4})_{2}}$

C + $\mathrm{O_{2}}$ ⎯⎯⎯→ $\mathrm{CO_{2}}$ + Heat. This reaction is an example of (a) Exothermic reaction (b) Endothermic reaction (c) Endo and exothermic reaction (d) Photochemical reaction

One mole of oxygen gas contains how many gas molecules? (a) $6.023 \times 10^{20}$ (b) $6.023 \times 10^{21}$ (c) $6.023 \times 10^{23}$ (d) $6.023 \times 10^{24}$

Atomic mass of carbon is 12 amu but 1 amu is equal to (a) $1.66 \times 10^{-20}$ gm (b) $1.66 \times 10^{-22}$ gm (c) $1.66 \times 10^{-24}$ gm (d) $1.66 \times 10^{-23}$ gm

Which one of the following statements is correct for basic radical? (a) Basic radical contains –ve charge. (b) Basic radical is obtained from Acid. (c) Basic radical is +ve charge particals obtained from base (d) Basic radical is Blue in colour

The correct molecular formula of baking soda is (a) $\mathrm{Na_{2}CO_{3}}$ (b) $\mathrm{NaHCO_{3}}$ (c) $\mathrm{Na_{2}CO_{3}}$ .10H2O (d) $\mathrm{NaCO_{3}}$

phenolphthalein indicator becomes pink in (a) Acidic medium (b) Neutral medium (c) Alkaline medium (d) Salt solution

Which gas turns moist blue litmus paper red and produce white precipitate when bubbled through calcium hydroxide solution? (a) Carbon monoxide (b) Carbon dioxide (c) Ammonia (d) Hydrogen chloride

Iron is extracted from (a) Haematite (b) Bauxite (c) Felspar (d) Chalcopyrite

Which of the following is used for the preparation of high-quality toilet soaps & cosmetics goods? (a) Methyl alcohol (b) Glycerol (c) Ethyl alcohol (d) Ether

Cement is the mixture of (a) Calcium carbonate and calcium chloride (b) Calcium silicate and calcium aluminate (c) Calcium sulphate & sodium chloride (d) Calcium oxide & carbon

Ordinary glass is also called as (a) Hard glass (b) Boro–silicate glass (c) Soft glass (d) Lead crystal glass

Chemicals used to control the harmful insects are called (a) Chemical fertilizer (b) Insecticides (c) Fertilizers (d) Pesticides

Which of the following forms a colloidal solution in water? (a) Glucose (b) Starch (c) Sodium Chloride (d) Urea

A compound was found to contain nitrogen and oxygen in the ratio 28 : 64. The formula of the compound is (a) $\mathrm{NO}$ (b) $\mathrm{N_2O_3}$ (c) $\mathrm{N_2O_4}$ (d) $\mathrm{N_2O_5}$

Chemical formula of a particular compounds reflects (a) Shape of its molecule (b) Size of its molecule (c) Total number of atoms in a molecule (d) Number of different types of atoms in a molecule

Electronic configuration of $\mathrm{M^{2+}}$ ion is 2, 8, 14 and its atomic weight is 56 amu. The number of neutrons in its nucleus are (a) 30 (b) 32 (c) 34 (d) 42

Atoms combine in a small whole number ratio, this concept was proposed by (a) Dalton (b) Avogadro (c) Gay Lussac (d) Berzelius

Two substance P and Q combine to give a third substance R. The process is exothermic and R has properties different from those of P and Q. Is the substance R (a) An element (b) A mixture (c) A compound (d) An atom

Which of the following is called Sylvine? (a) KCl (b) NaCl (c) $\mathrm{CaCl_2}$ (d) $\mathrm{MgCl_2}$

Liquid silver is (a) Ag (b) Mg (c) Hg (d) none

The general formula of Paraffin is (a) $\mathrm{C_nH_{2n+1}\cdot X}$ (b) $\mathrm{C_nH_{2n}}$ (c) $\mathrm{C_nH_{2n-2}}$ (d) $\mathrm{C_nH_{2n+2}}$

In IUPAC system of nomenclature, 'But' in hydrocarbon indicates (a) Prefix (b) Word root (c) Primary suffix (d) Secondary suffix

You are given a mixture of sand and common salt. Which process should apply to get pure common salt? (a) Dissolution and Evaporation (b) Evaporation and Crystallization (c) Evaporation and Sublimation (d) Sublimation and Crystallization

Two isotonic elements X and Y have atomic masses 54 and 56 respectively. If atomic number of X is 26, the atomic number of Y will be (a) 26 (b) 27 (c) 28 (d) 30

German silver is an alloy of (a) Fe, Cr, Ni (b) Cu, Zn, Ag (c) Cu, Zn, Ni (d) Cu, Sn, Al