question_answer

For a first order reaction \[A\to B\] the reaction rate at reactant concentration of \[0.01M\] is found to be \[2.0\times {{10}^{-5}}mol\,\,{{L}^{-1}}{{s}^{-1}}.\] The half life period of the reaction is :-

A)  300 s              

B)  30 s

C)  220 s              

D)  347 s