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Chemical Kinetics Multiple Choice Questions and Answers

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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) If 75% of a first order reaction was completed in 60 minutes , 50% of the same reaction under the same conditions would be completed in
[A] 20 minutes
[B] 30 minutes
[C] 35 minutes
[D] 75 minutes
Answer: 30 minutes
(2) The half life period of a radioactive element is 140 days. After 560 days , 1 g of element will be reduced to
[A] (1/2)g
[B] (1/4)g
[C] (1/8)g
[D] (1/16)g
Answer: (1/16)g

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(3) The correct difference between first and second order reactions is that
[A] A first order reaction can be catalysed; a second order reaction cannot be catalysed.
[B] The half life of a first order reaction does not depend on [A0]; the half life of a second order reaction does depend on [A0].
[C] The rate of a first order reaction does not depend on reactant concentrations; the rate of a second order reaction does depend on reactant concentrations.
[D] The rate of a first order reaction does depend on reactant concentrations; the rate of a second order reaction does not depend on reactant concentrations.
Answer: The half life of a first order reaction does not depend on [A0]; the half life of a second order reaction does depend on [A0].
(4) After 2 hours, a radioactive substance becomes (1/16)th of original amount. Then the half life ( in min) is
[A] 60 minutes
[B] 120 minutes
[C] 30 minutes
[D] 15 minutes
Answer: 30 minutes

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