Relevant Titles 

1. CBSE Class 11 Chemistry Chapter 7 Equilibrium – MCQs with Answers

2. Equilibrium Concepts Class 11 Chemistry Online Test | NCERT Quiz

3. Class 11 Chemistry Equilibrium MCQs – Free Online Practice Test

4. Top NCERT-Based Equilibrium Questions for CBSE Class 11 Students

5. Practice Class 11 Physical Chemistry Chapter 7 – Equilibrium Concepts Quiz

Introduction

CBSE Class 11 Chemistry MCQs – Chapter 7: Equilibrium Concepts

Understanding chemical equilibrium is essential for mastering Physical Chemistry in CBSE Class 11. This online MCQ practice test on Equilibrium Concepts covers key areas such as the Law of Mass Action, Equilibrium Constant (Kc and Kp), Le Chatelier’s Principle, and the effect of temperature, pressure, and concentration on equilibrium systems.

These Equilibrium Class 11 Chemistry MCQs are prepared strictly as per the NCERT syllabus, ensuring accuracy and relevance for CBSE board exam preparation. Each question is designed to test conceptual clarity and problem-solving ability—helping students understand both dynamic equilibrium and factors affecting equilibrium.

Students can use this online test for quick revision, timed practice, and performance evaluation. Attempting these questions will strengthen your understanding of equilibrium in gaseous and aqueous systems and enhance your exam readiness.

Sample MCQs (with Answers and Explanations)

Q1. A reaction reaches chemical equilibrium when:
a) All reactants are converted into products
b) Forward and reverse reaction rates become equal
c) The reaction stops completely
d) Concentration of products becomes zero
Answer: b) Forward and reverse reaction rates become equal
Explanation: Chemical equilibrium is dynamic — both reactions continue, but rates are equal, keeping concentrations constant.

Q2. For the reaction 2NO2(g) ⇌ N2O4(g), an increase in pressure will:
a) Shift equilibrium toward N2O4
b) Shift equilibrium toward NO2
c) No effect
d) Change Kc
Answer: a) Shift equilibrium toward N2O4
Explanation: Higher pressure favors the side with fewer moles of gas (Le Chatelier’s Principle).

Q3. The equilibrium constant Kp is related to Kc by:
a) Kp = Kc(RT)^Δn
b) Kp = Kc / (RT)^Δn
c) Kp = Kc(RT)
d) Kp = Kc / RT
Answer: a) Kp = Kc(RT)^Δn
Explanation: The relationship depends on the change in moles of gas (Δn) between reactants and products.

Q4. Adding an inert gas at constant volume to an equilibrium system will:
a) Shift equilibrium toward products
b) Shift equilibrium toward reactants
c) Not affect the equilibrium position
d) Increase K
Answer: c) Not affect the equilibrium position
Explanation: Inert gas addition at constant volume doesn’t change partial pressures of reactants/products, so equilibrium is unaffected.

Q5. Which of the following affects the value of equilibrium constant (K)?
a) Concentration
b) Catalyst
c) Temperature
d) Pressure
Answer: c) Temperature
Explanation: The equilibrium constant (K) changes only with temperature since it depends on the thermodynamic nature (ΔH) of the reaction.

✅ Perfect for:

• CBSE Class 11 students preparing for board exams

• NCERT-based competitive exam practice

• Online chemistry quiz and concept revision