In the first order reaction, the concentration of the reactent is redduced to 25% in one hour. The half life period of the reactiion is a)2 hr b)4hr c)1/2 hr d)1/4 hr

Options

A. 2 hr
B. 4 hr
C. 1/2 hr
D. 1/4 hr.

Explanation

`k= 2.303/1 log. (100)/25`
`k=2.303log 2^2= 2xx 2.303 log 2`
and `t_(50%)= 2.303/klog2= 1/2"hour"`