Chemical Kinetics Multiple Choice Questions With Answers

Questions

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

View Answer

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

View Answer

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.

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