This exothermic reaction is catalyzed by ${\mathrm{MnO}}_2\left(\mathrm{s}\right)$.

$2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{aq}\right)⟶2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$

Which of the following will increase the rate of this reaction?

(P) Raising the temperature 

(Q) Increasing the surface area of ${\mathrm{MnO}}_2\left(\mathrm{s}\right)$.

Given reaction is,

$2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{aq}\right)⟶2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$

The catalyst used in this reaction is,

${\mathrm{MnO}}_2\left(\mathrm{s}\right)$

In this  the rate of this reaction increases when the temperature is increased or the surface area of ${\mathrm{MnO}}_2\left(\mathrm{s}\right)$ is increased.