$A$ 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.

(N/A) $(i)$ Since the colourless liquid $A$ contains only hydrogen and oxygen and decomposes slowly on exposure to light but is stabilised by the addition of urea,liquid $A$ is hydrogen peroxide $(H_2O_2)$. The structure of $H_2O_2$ is an open book structure.
$(ii)$ The decomposition reaction is:
$2 H_2O_2 \xrightarrow{h\nu} 2 H_2O + O_2$