The normality of $20$ volume solution of hydrogen peroxide is (in $N$)

During which of the following reactions will a gaseous product $NOT$ be produced?

$10 \, mL$ of $H_2O_2$ solution $(d = 1 \, g/mL)$ when reacted with $KI$ solution produced $0.5 \, g$ of iodine. Calculate the percentage purity of $H_2O_2$ .............. $\%$

The chemical nature of hydrogen peroxide is

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
${H_2}{\underline{S}}_2{O_8} + {H_2}O \longrightarrow {H_2}S{O_4} + {H_2}O_2$

Why is hydrogen peroxide stored in wax-lined bottles?