The compound that can work both as an oxidising and reducing agent is

The molecular mass of hydrogen peroxide is $34$. Its unit is .....

$A$ given sample of $H_2O_2$ solution has a volume of $100 \, cm^3$. It produces $1000 \, cm^3$ of $O_2$ gas at $STP$. What is the volume strength of the given $H_2O_2$ sample?

Calculate the strength of $10$ volume solution of hydrogen peroxide. (in $, g/L$)

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

$H_2O_2$ restores the color of old lead paintings,blackened by the action of $H_2S$ gas by: