Explain the reaction of ammonia with chlorine and chlorides at different conditions.

Explain the commercial method of preparation of nitric acid.

Give a test for sulphate?

An element A occupies group number 17 and period number 2 is the most electronegative element. Element A reacts with another element B) which occupies group number 17 and period number 4 to give a compound Compound C undergoes sp³d² hybridisation and has octahedral structure. Identify the elements a and B and the compound C. Write the reactions.

Discuss the anomalous nature of fluorine.