CBSE Class 12 Chemical Kinetics Multiple Choice Questions with Answers. MCQ Questions Class 12 Chemical Kinetics with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemical Kinetics MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Chemical Kinetics with Answers - Set - 1
Question 1:
For the reaction; 2N2O5 → 4NO2 + O2 rate and rate constant are 1.02 × 10–4 and 3.4 × 10–5 sec–1 respectively, then concentration of N2O5 at that time will be
(a) 1.732
(b) 3
(c) 1.02 × 10–4
(d) 3.4 × 105
Correct Answer – (B)
Question 2 :
If the rate of the reaction is equal to the rate constant, the order of the reaction is
(a) 0
(b) 1
(c) 2
(d) 3
Correct Answer – (A)
Question 3 :
For the reaction, A + B → products, it is observed that
(i) on doubling the initial concentration of A only, the rate of reaction is also doubled and
(ii) on doubling the initial concentration of both A and B, there is a change by a factor of 8 in the rate of the reaction.
The rate of this reaction is given by
(a) rate = k[A][B]2
(b) rate = k[A]2[B]2
(c) rate = k[A][B]
(d) rate = k[A]2[B]
Correct Answer – (A)
Question 4 :
Which one of the following statements for the order of a reaction is incorrect?
(a) Order can be determined only experimentally.
(b) Order is not influenced by stoichiometric coefficient of the reactants.
(c) Order of a reaction is sum of power to the concentration terms of reactants to express the rate of reaction.
(d) Order of reaction is always whole number.
Correct Answer – (D)
Question 5 :
For a reaction between A and B the order with respect to A is 2 and the order with respect to B is 3.
The concentrations of both A and B are doubled, the rate will increase by a factor of
(a) 12
(b) 16
(c) 32
(d) 10
Correct Answer – (C)
MCQ Questions Class 12 Chemical Kinetics with Answers
Question 6:
2A B → C, It would be a zero order reaction when
(a) the rate of reaction is proportional to square of concentration of A
(b) the rate of reaction remains same at any concentration of A
(c) the rate remains unchanged at any concentration of B and C
(d) the rate of reaction doubles if concentration of B is increased to double.
Correct Answer – (B)
Question 7:
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is
(a) 2
(b) –2
(c) 1
(d) –1
Correct Answer – (B)
Question 8:
The unit of rate constant for a zero order reaction is
(a) mol L–1 s–1
(b) L mol–1 s–1
(c) L2 mol–2 s–1
(d) s–1
Correct Answer – (A)
Question 9:
In a reaction, A + B → product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentration of both the reactants (A and B) are doubled, rate law for the reaction can be written as
(a) rate = k[A][B]2
(b) rate = k[A]2[B]2
(c) rate = k[A][B]
(d) rate = k[A]2[B]
Correct Answer – (D)
Question 10:
The rate constant of the reaction A B is 0.6 × 10–3 mol L–1 s–1. If the concentration of A is 5 M, then concentration of B after 20 minutes is
(a) 3.60 M
(b) 0.36 M
(c) 0.72 M
(d) 1.08 M
Correct Answer – (C)
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