Question

The unit of rate constant for a second order reaction is:

• A. $lit.sec$
• B. $lit.mole.sec$
• C. $mol{e}^{-1}.lit.se{c}^{-1}$
• D. $mole.sec$

Answer 1

The correct option is C $mol{e}^{-1}.lit.se{c}^{-1}$

Let the reaction be $2A\to product$

$Rateofreaction=k[A{]}^2.$
$k=\frac{r}{[A{]}^2}$
$=\frac{mole}{lit.sec}\times \frac{(lit{)}^2}{mol{e}^2}$
$\Rightarrow \frac{lit}{sec.mole}$
$\Rightarrow mol{e}^{-1}lit.se{c}^{-1}$

Option C is correct.