The structure of $H_2O_2$ is

$4 \ mL$ of '$X$ volume' $H_2O_2$ on heating gives $80 \ mL$ of oxygen at $STP$. The value of $X$ is:

$I. \, H_2O_2 + O_3 \rightarrow H_2O + 2O_2$
$II. \, H_2O_2 + Ag_2O \rightarrow 2Ag + H_2O + O_2$
The role of hydrogen peroxide in the above reactions is respectively:

$H_2O_2$ is always stored in black bottles because

The $pH$ of a solution of $H_2O_2$ is $6.0$. Some chlorine gas is bubbled into this solution. Which of the following is correct?

Select the correct statement.