Question

In the school laboratory, the chemistry teacher instructed the laboratory attendant to

store a liquid solution of a compound made up of hydrogen and oxygen elements in

brown bottles in dark room . He also told to add some urea to it and keep it free from

dust. The substance can act an oxidizing agent and reducing agent both in acidic and

alkaline media .

Answer the following questions:-

a) Name the liquid substance.

b) Give its structure.

c) What values does it carry in pollution control of domestic and industrial effluents. ​

Answer 1

Answer:

(a) liquid is likely to be nitric acid

(b) nitric acid molecular formula HNO3

(c) it shows awareness of a person towards controlling pollution.

Answer 2

The liquid substance is hydrogen peroxide (H2O2).

• Hydrogen peroxide is photo sensitive and decompose into water and oxygen on exposure to light.So, it is stored in dark bottles in presence of substances like urea that reduces its decomposition rate.
• It can act as both oxidizin and reducing agent as the oxidation state of oxygen in it is -1.
• It has an open book type of structure with two oxygen single bonded to each othe an each oxyge single bonded to a hydrogen atom.
• Its property to release oxygen efficienty makes it very useful in pollution control.