The rate constant of a reaction is `0.69 xx 10^(-1)min^(-1)` and the initial concentration is `0.2 "mol l"^(-1)`. The half-life period is

Options

A. 400sec
B. 600sec
C. 800sec
D. 1200sec

Answer

B

Explanation

The unit of rate constant shows that reaction is of first order. For first order reaction, half life is independent of initial conc. of the reactant. Thus,
`t_(1//2)=(0.693)/(0.69xx10^(-1))=(0.693xx60)/(0.69xx10^(-1))=600s`.