Class 11 Chemistry Chapter 7 Equilibrium MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 7 Equilibrium. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

Download Chapter 7 Equilibrium MCQs PDF by clicking on the button below.
Download PDF

Class 11 Equilibrium MCQs

1. According to Lewis concept, an acid is:

(a) proton donor

(b) electron pair donor

(c) electron pair acceptor

(d) proton acceptor

Ans: (c)

Solution: According to Lewis concept, an acid is electron pair acceptor

2. Ostwald’s dilution law is applicable to:

(a) Strong electrolytes only

(b) Weak electrolyte only

(c) Non-electrolytes

(d) Strong and weak electrolytes

Ans: (b) Weak electrolyte only

Solution: Ostwald’s dilution law is applicable to weak electrolyte only

3. The pH of a solution of hydrochloric acid is 4. The molarity of the solution is:

(a) 4.0

(b) 0.4

(c) 0.0001

(d) 0.04

Ans: (c)

Ans: pH = – log [H⁺] , Here [H⁺] = 10^-4 , Molarity = 0.0001 M

4. The strong conjugate base is

(a) NO₃^2-

(b) Cl^–

(c) SO₄^2-

(d) CH₃COO^–

Ans: (d)

Solution: CH₃COO^– is the strongest conjugate base because CH₃COOH is a weak acid.

5. Which of the following pairs constitutes a buffer ?

(a) NaOH and HCl

(b) HNO₃ and NH₄NO₃

(c) HCl and KCl

(d) HNO₂ and NaNO₂

Ans: (d)

Solution: HNO₂ and NaNO₂ represent a buffer mixture.

6. Le Chatelier’s principle is applicable to:

(a) only homogeneous chemical reversible reactions

(b) only heterogeneous chemical reversible reactions

(c) only physical equilibria

(d) all systems, chemical or physical in equilibrium.

Ans: (d)

Solution: Le Chatelier’s principle is applicable to all systems, chemical or physical in equilibrium.

7. Which of the following is the weakest base?

(a) NaOH

(b) Ca(OH)₂

(c) NH₄OH

(d) KOH

Ans: (c)

Solution: NH₄OH is the weakest base.

8. When NH₄Cl is added to NH₄OH solution the dissociation of ammonium hydroxide is reduced. It is due to:

(a) common ion effect

(b) hydrolysis

(c) oxidation

(d) reduction

Ans: (a)

Solution: ammonium hydroxide is reduced due to presence of common ion NH₄⁺

9. For the reversible reaction

N₂ (g) + 3H₂(g) ⇋ 2NH₃ + Heat

The equilibrium shifts in forward direction

(a) by increasing the concentration of NH₃(g)

(b) by decreasing the pressure

(c) by decreasing the concentration of N₂ and H₂

(d) by increasing pressure and decreasing temperature

Ans: (d)

Solution: Le Chatelier’s principle suggests that in the formation of ammonia, the equilibrium shifts in forward direction by increasing pressure and decreasing temperature.

10. A base according to Bronsted concept is a substance which can:

(a) lose pair of electron

(b) donate protons

(c) gain a pair of electrons

(d) accept protons

Ans: (d)

Solution: A base according to Bronsted concept is a substance which can accept protons.

Recommended Videos