$H_2SO_4$ can be dried by :

Rohan heard that instructions were given to the laboratory attendant to store a particular chemical,i.e.,keep it in the dark room,add some urea in it,and keep it away from dust. This chemical acts as an oxidising as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents.
$(i)$ Write the name of this compound.
$(ii)$ Explain why such precautions are taken for storing this chemical.

The strength of $11.2$ volume solution of $H_2O_2$ is: [Given that molar mass of $H = 1 \ g \ mol^{-1}$ and $O = 16 \ g \ mol^{-1}$]

$A$ $30 \%$ solution of hydrogen peroxide is

$H_2O_2$ is obtained by which of the following?

On shaking $H_2O_2$ with acidified potassium dichromate and ether,the ethereal layer becomes: