The last drop of water can be removed from $H_2O_2$ by :-

Fenton’s reagent is

What is the order of the $K_a$ value for $H_2O_2$?

Which of the following cannot be reduced by $H_2O_2$?

Decomposition of $H_2O_2$ is prevented 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