Question

A substance having rate constant $k$ and initial concentration $a$ reacts according to zero order kinetics. What will be the time for the reaction to go to completion?

• A. $\frac{a}{k}$
• B. $\frac{k}{a}$
• C. $\frac{a}{2k}$
• D. $\frac{2k}{a}$

Answer 1

The correct option is A $\frac{a}{k}$

For zero order reaction, $t=\frac{a-at}{k}$

where at=concentration of reactant at time t

For completion of reaction, at=0

$t=\frac{a}{k}$