How is sulphuric acid manufacture by contact process ?

How is sulphuric acid prepared by contact process? Write its reaction with H_2 S and KBr .

Sulphuric acid is manufactured by the contact process. Which step is not involved in the process?

Sulphuric acid is manufactured by Contact process : Give all the main reactions of this process.

Sulphuric acid is manufactured by Contact process : Give the conditions for the oxidation of SO_2 .

Sulphuric acid is manufactured by Contact process : Give two balanced equations to obtain SO_2 by this process

Sulphuric acid is manufactured by Contact process : Name the chemical used to dissolve SO_3 and also name the product formed.

Sulphuric acid is manufactured by Contact process : Why H_2SO_4 is not obtained by directly reacting SO_3 with water ?