MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics with Answers

Here you will find NCERT MCQ Questions for Class 12 Chemistry with Answers PDF Free Download based on the important concepts and topics given in the textbook.This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Class 12 Chemistry. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

Q.1 In chemical equation H2 (g) + I2 (g) ⇌ 2HI (g) the equilibrium constant Kp depends on

(a) total pressure
(b) catalyst used
(c) amount of H2 and I2
(d) temperature

(b) catalyst used

Q.2 If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be

(a) 2
(b) 3
(c) 1
(d) 0

(b) 3

Q.3 In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms-1 during this interval ?

(a) 2 × 10-4
(b) 4 × 10-2
(c) 2 × 10-2
(d) 1 × 10-2

(a) 2 × 10-4

Q.4 The decomposition of dimethyl ether is a fractional order reaction. The rate is given by rate =k(PCH3OCH3)3/2. If the pressure is measured in bar and time in minutes, then what are the units of rate and rate constant

(a) bar min-1, bar2 min-1
(b) bar min-1, bar1/2 min-1
(c) bar1/2 min-1, bar2 min-1
(d) bar min-1, bar1/2 min-1

(b) bar min-1, bar1/2 min-1

Q.5 A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?


(a) 9 times
(b) 4 times
(c) 16 times
(d) 8 times

(c) 16 times

Q.6 Which of the following, is an example of a fractional order reaction?

(a) NH4NO2 → N2 + 2H2O
(b) NO + O3 → NO2 + O2
(c) 2NO + Br2 → 2NOBr
(d) CH3CHO → CH4 + CO

(d) CH3CHO → CH4 + CO

Q.7 The unit of rate constant for the reaction
2H2 + 2NO → 2H2O + N2
which has rate = K|H2||NO|², is

(a) mol L-1 s-1
(b) s-1
(c) mol-2 L² s-1
(d)mol L-1

(c) mol-2 L² s-1

Q.8 Fora reaction x + y → z, rate ∝ |X|. What is (i) moleculariiy and (ii) order of reaction?

(a) (i)2, (ii) 1
(b) (i)2,(ii) 2
(c) (i) 1, (ii) 1
(d) (i) 1, (ii) 2

(a) (i)2, (ii) 1

Q.9 For a reaction nx – y → z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction?

(a) 2
(b) 1
(c) 3
(d) 0

(c) 3

Q.10 The rate constant of a reaction depends upon


(a) temperature of the reaction
(b) extent of the reaction
(c) initial concentration of the reactants
(d) the time of completion of reaction

(d) the time of completion of reaction

Q.11 The chemical reaction, 2O3 → 3O2 proceeds as
O3 ⇌ O2 + |O| (fast)
|O| + O3 → 2O2 (slow)
The rate law expression will be

(a) Rate = k [O] [O3]
(b) Rate = k [O3]² [O2]-1
(c) Rate = k [O3]²
(d) Rate = k [O2] [O]

(b) Rate = k [O3]² [O2]-1

Q.12 The unit of rate and rate constant are same fora

(a) zero order reaction
(b) first order reaction
(c) second order reaction
(d) third order reaction

(a) zero order reaction

Q.13 The number of molecules of the reactants taking part in a single step of the reaction is indicative of

(a) order of a reaction
(b) molecuiarity of a reaction
(c) fast step of the mechanism of a reaction
(d) half-life of the reaction

(b) molecuiarity of a reaction

Q.14 Fora unimolecular reaction

(a) the order and molecuiarity of the slowest step are equal to one
(b) molecuiarity of the reaction can be zero, one or two
(c) molecuiarity of the reaction can be determined only experimentally
(d) more than one reacting species are involved in one step

(a) the order and molecuiarity of the slowest step are equal to one

Q.15 The overall rate of a reaction is governed by

(a) the rate of fastest intermediate’step
(b) the sum total of the rates of all intermediate steps
(c) the average of the rates of all the intermediate steps
(d) the rate of slowest intermediate step

(d) the rate of slowest intermediate step

Q.16 The order of reaction is decided by

(a) temperature
(b) mechanism of reaction as well as relative concentration of reactants
(c) molecularity
(d) pressure

(b) mechanism of reaction as well as relative concentration of reactants

Q.17 Rate constant in case of first order reaction is

(a) inversely proportional to the concentration units
(b) independent of concentration units
(c) directly proportional to concentration units
(d) inversely proportional to the square of concentration units

(b) independent of concentration units

Q.18 A first order reaction has a half life period of 34.65 seconds. Its rate constant is

(a) 2 × 10-2 s-1
(b) 4 × 10-4 s-1
(c) 20 s-1
(d) 2 × 10-4 s-1

(b) 4 × 10-4 s-1

Q.19 If a graph is plotted between In k and 1/T for the first order reaction, the slope of the straight line so obtained is given by

(a) –EaR
(b) Ea2.303R
(c) 2.303Ea.R
(d) Ea2.303

(a) –EaR

Q.20 The unit of rate constant for a zero order reaction is

(a) mol L-1s-1
(b) s-1
(c) L mol-1s-1
(d) L2mol-2s-1

(a) mol L-1s-1

Q.21 A reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will

(a) triple
(b) increase by a factor of 4
(c) double
(d) remain unchanged

(b) increase by a factor of 4

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