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) The compound is hydrogen peroxide `(H_(2)O_(2))`.
(ii) `H_(2)O_(2)` decomposes slowly when exposed to air. `2H_(2)O_(2)(l) overset("sun light")to 2H_(2)O(l)+O_(2)(g)`
Dust also causes explosive decomposition of hydrogen peroxide. Therefore it is kept is dark coloured wax linked glass bottles or in plastic bottles. Urea is normally added to act as stabiliser. For the oxidising and reducing properties of `H_(2)O_(2)`, consult section 9.13