For a first order reaction `A rarrB` , the reaction rate at reactant concentration of 0.01 M is found to be `2.0xx10^(-5) "mol L"^(-1) s^(-1)`. The half life period of the reaction is

Options

A. 220s
B. 30s
C. 300s
D. 347s

Answer

D

Explanation

`R=k[A]`
`2xx10^(-5)=kxx10^(-2)`
`k=2xx10^(-3)s^(-1)`
`t_(1//2)=(0.693)/(k)=(0.693)/(2xx10^(-3))=(693)/(2)=347s`