Question

Chemical generally used for detection of sulphate

Answer 1

Diphenylamine test. Diphenylamine may be used as a wet chemical test for the presence of sulphate.

Answer 2

detection of sulphur
1. Sodium nitroprusside test
During the preparation of Lassaigne's extract, sulphur from the organic compound reacts with sodium to form sodium sulphide. It gives a purple colour with sodium nitroprusside due to the formation of sodium thionitroprusside.

2. Lead acetate test

Sodium sulphide formed during the preparation of Lassaigne's extract reacts with lead acetate to yield lead sulphide as black precipitate.