Question

In a reaction, the unit of both rate constant and rate of the reaction are same. So, the order of the reaction is:

• A. $1$
• B. $0$
• C. $2$
• D. $3$

Answer 1

The correct option is B $0$

The rate of reaction is given by concentration of reactant consumed or concentration of product formed per unit time.
Unit of rate of reactions is ${\text{mol L}}^{-1}{\text{s}}^{-1}$.
We know that,
Unit of rate constant for $n^{th}$ order of a reaction is:
$[\frac{\text{L}}{\text{mol}}{]}^{n-1}\times {\text{s}}^{-1}$
From the above equation, unit or rate constant for zero order is ${\text{mol L}}^{-1}{\text{s}}^{-1}$.
Hence, for zero order reaction, unit of rate of reaction and unit of rate constant is same.