Which of the following cannot be oxidised by $H_2O_2$?

Complete the following chemical reactions.
$i$. $PbS_{(s)} + H_2O_{2_{(aq)}} \rightarrow$
$ii$. $MnO_{4_{(aq)}}^{-} + H_2O_{2_{(aq)}} \rightarrow$
$iii$. $CaO_{(s)} + H_2O_{(g)} \rightarrow$
$iv$. $AlCl_{3_{(s)}} + H_2O_{(l)} \rightarrow$
$v$. $Ca_3N_{2_{(s)}} + H_2O_{(l)} \rightarrow$
Classify the above into $a$. hydrolysis,$b$. redox,and $c$. hydration reactions.

In $H_2O_2$,the two oxygen atoms are connected by:

$6.8 \, g$ of $H_2O_2$ is dissolved in $0.2 \, L$ of solution. Then the solution will be labelled as ............. $V$ volume strength.

How should $H_2O_2$ be stored?

Acidified solution of chromic acid on treatment with hydrogen peroxide yields: