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Chemical Kinetics Questions and Answers | Chemistry MCQs for Class 12 with Answers Chemical Kinetics

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Free download in PDF Chemical Kinetics Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) This reaction follows first order kinetics. The rate constant at particular temperature is 2.303 × 10−2 hour−1 . The initial concentration of cyclopropane is 0.25M. What will be the concentration of cyclopropane after 1806 minutes? (log 2 = 0.3010)
[A] 0.125M
[B] 0.215M
[C] 0.25 × 2.303M
[D] 0.05M
Answer: 0.215M
(2) For a first order reaction, the rate constant is 6.909 min-1.the time taken for 75% conversion in minutes is
[A] (3/2)log2
[B] (2/3)log2
[C] (3/2)log(3/4)
[D] (2/3)log(4/3)
Answer: (2/3)log2

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(3) In a first order reaction x → y ; if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (c)
(4) Predict the rate law of the following reaction based on the data given below

2A + B → C + 3D

[A] rate = k [ A]2 [B]
[B] rate = k [ A][B]2
[C] rate = k [ A][B]
[D] rate = k [ A]1/2 [B]3/2
Answer: rate = k [ A][B]2
(5) Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.

Reason: rate constant also doubles

[A] Both assertion and reason are true and reason is the correct explanation of assertion.
[B] Both assertion and reason are true but reason is not the correct explanation of assertion.
[C] Assertion is true but reason is false.
[D] Both assertion and reason are false.
Answer: Assertion is true but reason is false.
(6) The rate constant of a reaction is 5.8 × 10−2 s−1 . The order of the reaction is
[A] First order
[B] zero order
[C] Second order
[D] Third order
Answer: First order
(7)

For the reaction  N2O5(g) → 2NO2 (g) + ½ O2(g), the value of rate of disappearance of N2O5 is given as 6.5 × 10-2 mol L-1 s-1. The rate of formation of NO2 and O2 is given  respectively as

[A]

( 3.25 × 10−2 mol L−1s−1 ) and (1.3 × 10−2 mol L−1s−1 )

[B]

(1.3 × 10−2 mol L−1s−1 ) and ( 3.25 × 10−2 mol L−1s−1 )

[C]

(1.3 × 10−1 mol L−1s−1 ) and ( 3.25 × 10−2 mol L−1s−1 )

[D] None of these
Answer:

(1.3 × 10−1 mol L−1s−1 ) and ( 3.25 × 10−2 mol L−1s−1 )

(8) During the decomposition of H2O2 to give dioxygen, 48 g O2 is formed per minute at certain point of time. The rate of formation of water at this point is
[A] 0.75 mol min−1
[B] 1.5 mol min−1
[C] 2.25 mol min−1
[D] 3.0 mol min−1
Answer: 3.0 mol min−1
(9) If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is
[A] Zero
[B] one
[C] Fraction
[D] none
Answer: Zero
(10) In a homogeneous reaction A →B + C + D , the initial pressure was P0 and after time t it was P. expression for rate constant in terms of P0, P and t will be

[A] (a)
[B] (b)
[C] (c)
[D] (c)
Answer: (a)

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