Nitrogen and Compounds



Preparation of dinitrogen



Properties of dinitrogen

i) It is a colourless, odourless, tasteless and non – toxic gas.
ii) It is chemically un-reactive at ordinary temperature due to triple bond in N ≡ N which has high bond dissociation energy.



1.     Ammonia molecule is trigonal pyramidal with nitrogen atom at the apex.

2.     It has 3 bond pairs and 1 lone pair.

3.     N is hybridised.


Haber’s process:

Pressure 20010 Pa Temperature 773 K Catalyst is FeO with small amounts of and


Oxides of Nitrogen

nitric acid

Ostwald Process: The NO thus formed is recycled and the aqueous can be concentrated by distillation upto ~ 68% by mass. Further concentration to 98% can be achieved by dehydration with concentrated . Nitric acid is strong oxidizing agent in the concentrated as well as in the dilute state.