Atomic hydrogen reacts with oxygen to give

What is the $O-O-H$ bond angle in the solid form of $H_2O_2$ (in $^{\circ}$)?

The compound which does not possess a peroxide linkage is

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 :

$H_2O_2$ cannot oxidise

Describe the structure of hydrogen peroxide $(H_2O_2)$.