Chemistry - Chemical Kinetics Question with Solution | TestHub

For the reaction
$5{\text{ Br}}^{–}\left(\text{aq}\right)+{\text{ BrO}}_{\text{3}}^{-}\left(\text{aq}\right)+\text{ 6}{\text{H}}^{\text{+}}\left(\text{aq}\right)\to \text{3}{\text{Br}}_{\text{2}}\left(\text{aq}\right)\text{+}3{\text{H}}_{\text{2}}\text{O }\left(\text{l}\right)$
the rate expression was found to be
$–\frac{\mathrm{d}\left[\mathrm{B}\mathrm{r}{\mathrm{O}}^{3–}\right]}{\mathrm{d}\mathrm{t}}=\mathrm{ }\mathrm{k}\mathrm{ }\left[\mathrm{B}{\mathrm{r}}^{–}\right]\mathrm{ }{\left[{\mathrm{H}}^{+}\right]}^2\mathrm{ }\left[\mathrm{B}\mathrm{r}{\mathrm{O}}_3^{-}\mathrm{ }\right]$
Which of the following statements is /are correct?
I. Doubling the initial concentration of all the reactants will increase the reaction rate by a factor of 8.
II. Unit of rate constant of the reaction in a buffer solution is$\mathrm{m}\mathrm{i}{\mathrm{n}}^{–1}$
III. Doubling the concentration of all the reactants at the same time will increase the reaction rate by a factor of 16
IV. rate of conversion of${\text{BrO}}_{\text{3}}^{-}$and rate of disappearance of$\mathrm{B}{\mathrm{r}}^{–}$are the same