Class 11 Chemistry MCQ Chapter 7 Equilibrium
Are you searching for Class 11 Chemistry MCQ Chapter 7 Equilibrium English Medium? If yes, then this article is an excellent resource for your AHSEC Higher Secondary First Year Chemistry preparation. Here, you will find important MCQ questions with answers from one of the most important chapters in Chemistry.
The chapter Equilibrium helps students understand how chemical and physical processes reach a state of balance. It covers key topics such as dynamic equilibrium, law of mass action, equilibrium constant, Le Chatelier’s Principle, ionic equilibrium, acids, bases, pH, and buffer solutions. These concepts are essential for solving numerical problems and understanding many chemical reactions.
All MCQs are prepared according to the latest AHSEC syllabus and examination pattern. These objective questions will help students revise important concepts, improve analytical thinking, and become familiar with exam-oriented questions. Regular practice can significantly improve accuracy and confidence.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you strengthen your concepts and achieve better results in Chemistry.
Part: I
Class 11 Chemistry MCQ Chapter 7 Equilibrium
Selected VSA & MCQ
I. Very Short Answer Questions (VSA)
Q What is chemical equilibrium?
Ans: State where forward and reverse reactions occur at equal rates.
Q What is dynamic equilibrium?
Ans: Equilibrium where reactions continue but no net change occurs.
Q What is an equilibrium constant?
Ans: Ratio of product and reactant concentrations at equilibrium.
Q What is Le Chatelier’s principle?
Ans: The system adjusts to oppose changes applied.
Q What is a reversible reaction?
Ans: Reaction proceeding in both directions.
Q What is an irreversible reaction?
Ans: Reaction proceeding only in one direction.
Q What is homogeneous equilibrium?
Ans: All reactants and products in same phase.
Q What is heterogeneous equilibrium?
Ans: Reactants and products in different phases.
Q What is the reaction quotient (Q)?
Ans: Ratio of concentrations at any time.
Q What is the degree of dissociation?
Ans: Fraction of substance dissociated.
Q What is acid?
Ans: Substance that donates H⁺ ions.
Q What is base?
Ans: Substance that accepts H⁺ ions.
Q What is pH?
Ans: Negative logarithm of hydrogen ion concentration.
Q What is buffer solution?
Ans: Solution that resists change in pH.
Q What is solubility product (Ksp)?
Ans: Product of ion concentrations in saturated solution.
Q What is ionic equilibrium?
Ans: Equilibrium involving ions in solution.
Q What is strong electrolyte?
Ans: Completely ionises in solution.
Q What is weak electrolyte?
Ans: Partially ionises in solution.
Q What is common ion effect?
Ans: Suppression of ionisation by common ion.
Q What is hydrolysis?
Ans: Reaction of salt with water.
Q What is conjugate acid?
Ans: Species formed after base gains proton.
Q What is conjugate base?
Ans: Species formed after acid loses proton.
Q What is Kw?
Ans: Ionic product of water.
Q What is pOH?
Ans: Negative log of OH⁻ concentration.
Q What is neutral solution?
Ans: pH = 7.
Q What is acidic solution?
Ans: pH < 7.
Q What is basic solution?
Ans: pH > 7.
Q What is equilibrium shift?
Ans: Change in equilibrium position.
II. Multiple Choice Questions (MCQs)
Q At equilibrium, reaction rates are:
(a) unequal
(b) equal
(c) zero
(d) constant
Ans: (b)
Q Equilibrium is:
(a) static
(b) dynamic
(c) stopped
(d) none
Ans: (b)
Q (K_c) depends on:
(a) temperature
(b) pressure
(c) volume
(d) concentration
Ans: (a)
Q Le Chatelier’s principle deals with:
(a) rate
(b) shift
(c) equilibrium
(d) none
Ans: (b)
Q Increase in pressure favours:
(a) more moles
(b) fewer moles
(c) equal moles
(d) none
Ans: (b)
Q Increase in temperature favours:
(a) exothermic
(b) endothermic
(c) both
(d) none
Ans: (b)
Q Reaction quotient Q equals K at:
(a) start
(b) equilibrium
(c) end
(d) none
Ans: (b)
Q Strong acids:
(a) partially ionise
(b) fully ionise
(c) none
(d) both
Ans: (b)
Q Weak electrolytes:
(a) fully ionise
(b) partially ionise
(c) none
(d) both
Ans: (b)
Q Buffer solution resists change in:
(a) volume
(b) pH
(c) pressure
(d) none
Ans: (b)
Q Ksp relates to:
(a) solubility
(b) pressure
(c) volume
(d) none
Ans: (a)
Q Common ion effect reduces:
(a) ionisation
(b) solubility
(c) both
(d) none
Ans: (c)
Q Neutral solution has pH:
(a) 0 (b) 7
(c) 14
(d) none
Ans: (b)
Q Acidic solution has pH:
(a) <7
(b) >7
(c) =7
(d) none
Ans: (a)
Q Basic solution has pH:
(a) <7
(b) >7
(c) =7
(d) none
Ans: (b)
Q Conjugate acid is formed when:
(a) acid loses H⁺
(b) base gains H⁺
(c) both
(d) none
Ans: (b)
Q Conjugate base is formed when:
(a) acid loses H⁺
(b) base gains H⁺
(c) both
(d) none
Ans: (a)
Q Hydrolysis occurs in:
(a) salts
(b) acids
(c) bases
(d) none
Ans: (a)
Q Degree of dissociation is:
(a) fraction
(b) mass
(c) volume
(d) none
Ans: (a)
Q Homogeneous equilibrium has:
(a) same phase
(b) different phase
(c) none
(d) both
Ans: (a)
Q Heterogeneous equilibrium has:
(a) same phase
(b) different phase
(c) none
(d) both
Ans: (b)
Q Increase in concentration shifts equilibrium:
(a) left
(b) right
(c) depends
(d) none
Ans: (c)
Q Catalyst affects:
(a) equilibrium position
(b) rate
(c) both
(d) none
Ans: (b)
Q Q < K means:
(a) backward
(b) forward
(c) equilibrium
(d) none
Ans: (b)
Q Q > K means:
(a) forward
(b) backward
(c) equilibrium
(d) none
Ans: (b)
Q Equilibrium constant for the reverse reaction is:
(a) same
(b) inverse
(c) zero
(d) none
Ans: (b)
Q K depends only on:
(a) pressure
(b) temperature
(c) concentration
(d) none
Ans: (b)
Q Assertion: Equilibrium is dynamic.
Reason: Forward and reverse reactions continue.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (a)
Q Assertion: K depends on temperature.
Reason: Equilibrium shifts with temperature.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (b)
Q Assertion: Catalyst changes equilibrium position.
Reason: It increases the rate of reaction.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (d)
Q Assertion: Buffer solutions resist pH change.
Reason: They contain a weak acid/base and its salt.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (a)
Q Assertion: Strong electrolytes fully ionise.
Reason: Intermolecular forces are weak.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (b)
Q Assertion: Common ion effect reduces ionisation.
Reason: Equilibrium shifts backward.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (a)
Q Assertion: pH decreases with an increase in H⁺ concentration.
Reason: pH is inversely related to H⁺.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Ans: (a)
