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

The volume strength of perhydrol is

$1 \ mL$ of "$x$ volume" $H_2O_2$ solution on heating gives $20 \ mL$ of oxygen gas at $STP$. The $(w/v) \%$ corresponding to "$x$ volume" of $H_2O_2$ is

Give the reaction of $I_2$ with $H_2O_2$ in the presence of a basic medium.

Which of the following is formed by the action of water on sodium peroxide?

How will you concentrate $H_2O_2$? Show differences between structures of $H_2O$ and $H_2O_2$ by drawing their spatial structures. Also, mention three important uses of $H_2O_2$.