Which of the following oxides will produce hydrogen peroxide upon reaction with dilute acid?

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.

Calculate the percentage by mass of a $H_2O_2$ solution that is $67.2$ volume strength.

In the laboratory, $H_2O_2$ is prepared by:

Two litres of $15$ volume solution of $H_2O_2$ on complete decomposition liberated $x$ litres of $O_2$ at $STP$. What is the value of $x$ (in litres)?

What is the amount of $H_2O_2$ in $gm$ present in $1 \, L$ of $1.5 \, N \, H_2O_2$ solution?