Welcome to our complete guide on Class 11 Chemistry Chapter 6 Equilibrium NCERT Solutions. This chapter explains important concepts such as chemical equilibrium, equilibrium constant, Le Chatelier’s principle, and ionic equilibrium including pH, buffer solutions, and solubility product.

Class 11 Chemistry Chapter 6 Equilibrium NCERT Solutions

All the in-text and numerical problems are solved clearly to help CBSE students strengthen their understanding and perform well in exams. These Class 11 Chemistry Chapter 6 Equilibrium NCERT Solutions are prepared as per the latest syllabus and are ideal for revision and concept clarity.

Class 11 Chemistry Chapter 6 Equilibrium NCERT Textbook Answers

Problem 6.1

Q: Write the expression for the equilibrium constant for the following reactions:
(i) 2NOCl(g) ⇌ 2NO(g) + Cl₂(g)
(ii) CaCO₃(s) ⇌ CaO(s) + CO₂(g)

A:
(i) Kc = [NO]²[Cl₂] / [NOCl]²
(ii) Kc = [CO₂] (solids are not included in the equilibrium expression)

Problem 6.2

Q: What will be the value of Kp for the reaction:
2SO₂(g) + O₂(g) ⇌ 2SO₃(g)
Given: Kc = 4.2 × 10¹⁰ at 727°C.

A:
Kp = Kc(RT)^Δn
Δn = 2 – (2 + 1) = –1
T = 727 + 273 = 1000 K
Kp = 4.2 × 10¹⁰ / (0.0821 × 1000)
Kp ≈ 5.12 × 10⁸

Problem 6.3

Q: At a certain temperature and total pressure of 10⁵ Pa, iodine vapour contains 40% by volume of I atoms. Calculate Kp for the equilibrium:
I₂(g) ⇌ 2I(g)

A:
Let total moles = 1 mol I₂ initially
At equilibrium:
I₂ = 0.6 mol
I = 0.4 × 2 = 0.8 mol
Total = 1.4 mol
P(I₂) = 0.6 / 1.4 = 0.428 atm
P(I) = 0.8 / 1.4 = 0.571 atm
Kp = (0.571)² / 0.428 ≈ 0.76

Problem 6.4

Q: Write the expressions for the equilibrium constants for the dissociation of the following acids:
(i) HF
(ii) HCl
(iii) HCN
(iv) HNO₃

A:
(i) HF ⇌ H⁺ + F⁻; K = [H⁺][F⁻] / [HF]
(ii) HCl ⇌ H⁺ + Cl⁻; K = [H⁺][Cl⁻] / [HCl]
(iii) HCN ⇌ H⁺ + CN⁻; K = [H⁺][CN⁻] / [HCN]
(iv) HNO₃ ⇌ H⁺ + NO₃⁻; K = [H⁺][NO₃⁻] / [HNO₃]

Problem 6.5

Q: Mention two factors that affect the equilibrium constant.

A:
Only temperature affects the equilibrium constant.
Catalysts and pressure do not affect the equilibrium constant.

Problem 6.6

Q: For the equilibrium:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
What will be the effect on the equilibrium if:
(i) More N₂ is added
(ii) Pressure is increased
(iii) Temperature is decreased

A:
(i) Equilibrium shifts to the right (forward direction)
(ii) Equilibrium shifts to the right (fewer gas molecules)
(iii) Equilibrium shifts to the right (exothermic reaction)

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