Q. The half-life period for a zero order reaction is equal to
A) $\frac{2k}{\lbrack A\rbrack_{0}}$
B) $\frac{\lbrack A\rbrack_{0}}{2k}$
C) $\frac{0.693}{k}$
D) $\frac{0.693}{k\lbrack A\rbrack_{0}}$
Explanation
(b)
For zero order reaction
$kt = \lbrack A\rbrack_{0} - \lbrack A\rbrack$
For $t_{1/2},\ \ \ \lbrack A\rbrack = \lbrack A\rbrack_{0}/2$
$\therefore kt_{1/2} = \lbrack A\rbrack_{0} - \lbrack A\rbrack_{0}/2$
$\ = \frac{\lbrack A\rbrack_{0}}{2}$
$\ t_{1/2} = \frac{\lbrack A\rbrack_{0}}{2k}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.