$A$ commercial sample of hydrogen peroxide is labeled as $10$ volume. Its percentage concentration is approximately ............... $\%$.

$Hydrogen$ $peroxide$ is reduced by:

When $H_{2}O_{2}$ is shaken with an acidified solution of $K_{2}Cr_{2}O_{7}$ in the presence of ether, the ethereal layer turns blue due to the formation of

Atomic hydrogen reacts with oxygen to give

What is the gas liberated when alkaline formaldehyde solution is treated with $H_2 O_2$?

Calculate the molarity and $\% \ W/V$ of $40$ volume of $H_2O_2$ solution.