Give the units of rate constants for Zero, first order and second order reactions.

$\mathrm{r}={\mathrm{kC}}^{\mathrm{n}}$
$\mathrm{k}=\frac{\mathrm{r}}{{\mathrm{C}}^{\mathrm{n}}}$ (where n = order of the reaction.)
Units of rate constant :
1) zero order reactions : $\text{ mol }{\mathrm{lit}}^{-1}{\sec }^{-1}$
2) 1st order reactions : ${\sec }^{-1}$
3) 2nd order reactions : $\text{ lit }{\mathrm{mol}}^{-1}{\sec }^{-1}$