Rohan heard that instructions were given to the laboratory attendent to store a particular chemical, i.e., keep it in the dark room,add some urea in it, and keep it away keep form 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 contral teratment of domestic and industrial effluents .

Explanation

(i) Hydrogen peroxide, `H_2 O_2`.
(i) `H_2O_2` decomposes in the presence of light and dust particles. Therefore, it is stored in wax-lined glass or plastic vessels in the presence of stabilizers like urea. It is also kept away from dust.