Why is hot concentrated sulphuric acid not used in the preparation of hydrogen?

Which test should be made before collecting hydrogen in a gas jar?

(a) Name the impurities present in hydrogen prepared in the laboratory.

(b) How can these impurities be removed?

Hydrogen is manufactured by 'Bosch Process'.

(a) Give the equations with conditions.

(b) How can you obtain hydrogen from a mixture of Hydrogen and carbon monoxide?