Niharika Rana

When the White ppt. obtained by treating NaCl solution with Ag NO3 solution is again treated with ammonia solution, it forms a water soluble salt, that will make the solution clear. 

NaCl (aqueous)  Na⁺  + Cl ^- 

When FeSO4 is added to the mixture of HNO3 and conc. H2SO4, it give brown ring of  Nitrosylferrous Sulphate (FeSO4.NO) which forms on the point of contact of the two reagents. 

It is used to give the test of nitric acid known as brown ring test. 

In the ring test of nitrate ion, Nitrosylferrous Sulphate (FeSO₄.NO) - an unstable complex salt is formed. Due to the formation of this compound, a brown coloured ring is seen in the undisturbed test tube.

Despite H₂SO₄ being a very good moisture absorbing compound, it cannot be used to dehydrate ammonia gas because ammonia gas reacts with Sulphuric Acid when passed over it.

The reaction is as follows:

2NH₃ + H₂SO₄ ----> (NH₄)₂SO₄

(Ammonium Sulphate)

 Haber Process is used to obtain ammonia by reacting nitrogen from the air with hydrogen (derived mainly from methane).

Hydrogen doesn’t react with Nitrogen at ordinary temperature . But when the mixture of pure Nitrogen and Hydrogen in ratio 1:3 by volume is heat at 450C under a pressure 200-900 atm in presence of Fe and Mo as catalyst Ammonia gas is obtained.

N2 + 3H2 ———–> 2NH3 + 22.4Kcal

The major cause of ozone layer depletion is the release of excess Green House Gases like Chlorofluorocarbons in the atmosphere.

Thus, following things can be done to control ozone layer depletion:

• Reduce dependency upon technologies that emit GHGs.
• Make use of alternative sources of energy that are environment-friendly.
• Reduce the industrial wastes that can potentially cause harm to the ozonosphere.
• Generate mass awareness programmes regarding this problem.