Equilibrium MCQ

Question 1. The equilibrium expression, Kc= [C02] represents the reaction.

NCERT Solutions for Class 11 Chemistry Chapter 7 Equilibrium MCQ Q1

Answer: 1.(b) Caco3 — Cao + Co2

Question 2. Hydrogen molecule (H2) can be dissociated into hydrogen atoms (H). Which one of the following changes will not increase the number of atoms present at equilibrium?

  • (a) adding H atoms
  • (b) increasing the temperature
  • (c) increasing the total pressure
  • (d) increasing the volume of the container

Answer: 2.(c) increasing the total pressure

Question 3. What is the expression for Keq? for the reaction

NCERT Solutions for Class 11 Chemistry Chapter 7 Equilibrium MCQ Q3

Answer  3.(c)

Question 4. A catalyst will increase the rate of a chemical reaction by

  • (a) shifting the equilibrium to the right
  • (b) shifting the equilibrium to the left
  • (c) lowering the activation energy
  • (d) increasing the activation energy

Answer:  4.(c) lowering the activation energy

Question 5. What is the correct expression for the representation of the solubility product constant of AgCr0?

NCERT Solutions for Class 11 Chemistry Chapter 7 Equilibrium MCQ Q5

Answer:  5.(a)

Question 6. In a closed system

NCERT Solutions for Class 11 Chemistry Chapter 7 Equilibrium MCQ Q6

Answer: 6.(d)

Question 7. H2+ S ——->H2S + energy. In this reversible reaction, select the factor which will shift the equilibrium to the right.

  • (a) adding heat
  • (b) adding H2S
  • (c) blocking hydrogen gas reaction
  • (d) removing hydrogen sulphide gas

Answer: 7.(a) adding heat

Question 8. What effect does a catalyst have on the equilibrium position of a reaction?

  • (a) a catalyst favours the formation of products
  • (b) a catalyst favours the formation of reactants
  • (c) a catalyst does not change the equilibrium position of a reaction
  • (d) a catalyst may favour reactants or product formation, depending upon the directiofi in which the reaction is written.

Answer:  8.(c) a catalyst does not change the equilibrium position of a reaction

Question 9. A chemist dissolves an excess of BaSO4 in pure water at 25°C if its Ksp= 1 x 10-10  what is the concentration of barium in the water?

  • (a) 10-4 M
  • (b) 10-5 M
  • (C) 10-15 M
  • (d) 10-6 M

Answer:  9.(c) 10-15 M

Question 10. If in a mixture where Q = k is combined, then what happens?

  • (a) the reaction shift towards products
  • (b) the reaction shift towards reactants
  • (c) nothing appears to happen, but forward and reverse are continuing at the same rate
  • (d) nothing happens

Answer: 10.(c) nothing appears to happen, but forward and reverse are continuing at the same rate