Hydrogen peroxide is used as

Electrolysis of $X$ gives $Y$ at anode. Vacuum distillation of $Y$ gives $H_2O_2$. The number of peroxy $(O-O)$ bonds present in $X$ and $Y$ respectively are :

Consider the following reaction:
$2 HSO_{4}^{-}(aq)$ $\xrightarrow[\text{(2) Hydrolysis}]{\text{(1) Electrolysis}} H_{2}S_{2}O_{8}(aq)$ $\xrightarrow{\text{Hydrolysis}} 2 HSO_{4}^{-}(aq) + 2 H^{+}(aq) + A(aq)$
The dihedral angle in product $A$ in its solid phase at $110 \ K$ is ....$^{\circ}$

What product is formed when $I_2$ reacts with $H_2O_2$ in a basic medium?

Write the chemical properties of hydrogen peroxide.

$(i)$ What mass of hydrogen peroxide will be present in $2 \, L$ of a $5 \, M$ solution?
$(ii)$ Calculate the mass of oxygen which will be liberated by the decomposition of $200 \, mL$ of this solution.