What is the volume strength of a $3.0 \ N$ $H_2O_2$ solution in liters?

The oxidation state of oxygen in hydrogen peroxide $(H_2O_2)$ is:

Which of the following yields $H_2O_2$ upon hydrolysis?

$A$ 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.

Hydrogen peroxide is used as

$12 \ V \ H_2O_2$ solution contains $680 \ g \ H_2O_2$. Then $\% \ W/V$ and volume of the solution is respectively ........ and ...........