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Multiple Choice Questions and Answers on Class 11 Chemistry Chapter 7 Chemical Equilibrium

Questions
1 Amines behave as
A Lewis Acids
B Lewis Base
C Aprotic Acid
D Neutral Compound

Answer:Lewis Base
2 Which of the following aqueous solutions will have highest pH?
A NaCl
B CH3COONa
C Na2CO3
D NH4Cl

Answer:Na2CO3
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3 Which of the following mixtures in aqueous solution of equimolar concentration acts as a buffer solution?
A HNO3 and NaOH
B H2SO4 and KOH
C NH4OH(excess) + HCl
D CH3COOH and NaOH(excess)

Answer:NH4OH(excess) + HCl
4 Among the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 25°C ) is
A Mg (OH)2
B Ca(OH)2
C Ba(OH)2
D Be(OH)2

Answer:Be(OH)2
5 Solubility of M2S salt is 3.5 × 10-6 then find out solubility product.
A 1.7 × 10-6
B 1.7 × 10-16
C 1.7 × 10-18
D 1.7 × 10-12

Answer:1.7 × 10-16
6 What is the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2 ?
A 11.31
B 11.7
C 13.30
D None of these

Answer:13.30
7 A certain buffer solution contains equal concentration of X– and HX. The ka for HX is 10-8. The pH of the buffer is
A 3
B 8
C 11
D 14

Answer:8
8 Among the following the weakest Bronsted base is
A F–
B Cl–
C Br–
D I–

Answer:I–
9 Concentration of the Ag-4 ions in a saturated solution of Ag2C2O4 is 2.2 × (a) 10-4 mol L-1. Solubility product of Ag2C2O4 is
A 2.66 × 10-12
B  4.5 × 10-11
C 5.3 × 10-12
D 2.42 × 10-8

Answer:5.3 × 10-12
10 When a neutral atom undergoes oxidation, the atoms oxidation state
A Decreases as it gains electrons
B Decreases as it loses electrons
C Increases as it gains electrons
D Increases as it loses electrons

Answer:Increases as it loses electrons
11 In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will
A Also be Doubled
B Be Halved
C Remain the Same
D Become One-Fourth

Answer:Remain the Same
12 Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.2 x 10-4 mol L-1. Solubility product of Ag2C2O42 is
A 2.66 × 10-12
B 4.5 × 10-11
C 5.3 × 10-12
D 2.42 × 10-8

Answer:5.3 × 10-12
13 When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the hydroxide ion concentration is
A 7.0
B 1.04
C 12.65
D 2.0

Answer:12.65
14 A weak acid HX has the dissociation constant 1 × 10-5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is
A 0.0001%
B 0.01%
C 0.1%
D 0.15%

Answer:0.01%
15 The pH of a 10-10 M NaOH solution is nearest to
A 10
B 7
C 4
D -10

Answer:4
16 Which of the following oxides is not expected to react with sodium hydroxide?
A CaO
B SiO2
C BeO
D B2O3

Answer:CaO
17 What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)2?
A 11.31
B 11.7
C 13.30
D None of these

Answer:13.30
18 Which of the following aqueous solutions will have highest pH?
A NaCl
B CH3COONa
C Na2CO3
D NH4Cl

Answer: Na2CO3
19 A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?
A 2, 5-Dihydroxy benzoic acid (pKa = 2.97)
B Acetoacetic acid (pKa = 3.58)
C m-Chlorobenzoic acid (pKa = 3.98)
D p-Chlorocinnamic acid (pKa = 4.41)

Answer:Acetoacetic acid (pKa = 3.58)
20 The solubility of Ca3(PO4)2 in water is y mol/L. Its solubility product is:
A 6y²
B 36 y4
C 64 y5
D 108 y5

Answer:108 y5

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