Chemistry - Complete s-block Question with Solution | TestHub

Sodium peroxide ($N{a}_2{O}_2$) and potassium superoxide ($K{O}_2$) both react with water (hydrolysis) to produce hydrogen peroxide ($H_2{O}_2$).

The reactions are:

$N{a}_2{O}_2(s)+2H_{2}O(l)\to 2NaOH(aq)+H_2{O}_2(aq)$

$2K{O}_2(s)+2H_{2}O(l)\to 2KOH(aq)+H_2{O}_2(aq)+O_2(g)$

Therefore, both options 2 and 3 yield $H_2{O}_2$ on hydrolysis.

The final answer is D.