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

(a) The name of the compound is `H_(2)O_(2)` . It acts as an oxidising as well as reducing agent in both acidic basic medium.
(b) `H_(2)O_(2)` is decomposed by light and dust particles . Urea is added as a negative catalyst , i.e., to check its decomposition
`2H_(2)O_(2)(aq) overset(hv)to 2H_(2)O (l) + O_(2)(g)`
Because of the oxidising properties, `H_(2)O_(2)` is widely used to control pollution by oxidation of harmful cyanides and obnoxious smelling sulphides present in domestic adn industrial effluents . It also helps in sewage disposal by supplying `O_(2)` for oxidation of organic matter present in sewage waters.