Chemical Kinetics Multiple Choice Questions With Answers

(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

(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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