The rate law for a reaction between reactants $A, B$ and $C$ is $r=K[A][B][C]^2$, if concentration of $A$ is…
The rate law for a reaction between reactants $A, B$ and $C$ is $r=K[A][B][C]^2$, if concentration of $A$ is halved, then rate of reaction
increase $\frac{1}{2}$ times
remains the same
decreases $\frac{1}{2}$ times
increase 2 times
Solution
$\mathrm{r}=\mathrm{K}[\mathrm{A}][\mathrm{B}][\mathrm{C}]^2$ of conc. of $\mathrm{A}$ is halved
$\mathrm{r}=\mathrm{K} \frac{[\mathrm{A}]}{2}[\mathrm{~B}][\mathrm{C}]^2$