Chemical Kinetics Ques 16

16. When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is :

[2015]

(a) First

(b) Second

(c) More than zero but less than first

(d) Zero

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Answer:

Correct Answer: 16.(a)

Solution:

(a) $t _{1 / 2}=\frac{0.693}{k}$

For first order $t _{1 / 2}$ is independent of initial concentration of reactant.