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

1 Amines behave as

A Lewis Acids

B Lewis Base

C Aprotic Acid

D Neutral Compound

View Answer

Answer:Lewis Base

2 Which of the following aqueous solutions will have highest pH?

A NaCl

B CH₃COONa

C Na₂CO₃

D NH₄Cl

View Answer

Answer:Na₂CO₃

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)

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:13.30

7 A certain buffer solution contains equal concentration of X^– and HX. The k_a for HX is 10^-8. The pH of the buffer is

A 3

B 8

C 11

D 14

View Answer

Answer:8

8 Among the following the weakest Bronsted base is

A F–

B Cl–

C Br–

D I–

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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%

View Answer

Answer:0.01%

15 The pH of a 10^-10 M NaOH solution is nearest to

A 10

B 7

C 4

D -10

View Answer

Answer:4

16 Which of the following oxides is not expected to react with sodium hydroxide?

A CaO

B SiO₂

C BeO

D B₂O₃

View Answer

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

View Answer

Answer:13.30

18 Which of the following aqueous solutions will have highest pH?

A NaCl

B CH₃COONa

C Na₂CO₃

D NH₄Cl

View Answer

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 (pK_a = 2.97)

B Acetoacetic acid (pK_a = 3.58)

C m-Chlorobenzoic acid (pK_a = 3.98)

D p-Chlorocinnamic acid (pK_a = 4.41)

View Answer