Perhydrol is an aqueous solution of

$A$ sample of $H_2O_2$ solution has a volume of $100 \, cm^3$ and it produces $1000 \, cm^3$ of $O_2$ gas at $STP$. What is the volume strength of the given $H_2O_2$ sample?

Which of the following liberates $O_2$ upon hydrolysis?

The starting material for convenient preparation of deuterated hydrogen peroxide $(D_2O_2)$ in the laboratory is:

Which method is currently used for the industrial production of $H_2O_2$?

$A$ colourless liquid $A$ contains $H$ and $O$ elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.
$(i)$ Suggest the possible structure of $A$.
$(ii)$ Write the chemical equation for its decomposition reaction in light.