Which oxide of nitrogen is used as a catalyst in lead chamber process for the manufacture of `H_2SO_4`?

Oxide of nitrogen used as catalyst in lead chamber process for the manufacture of H_2SO_4 is:

Oxide of nitrogen used as a catalyst in the lead chamber process for the manufacture of sulphuric acid is

Which catalyst is used in contact process for manufacture of H_2SO_4 ?

Name the catalyst used in the contact process of manufacture of H_2SO_4

Discuss contact process for manufacture of H_2SO_4 .

The catalyst used in Bosch process of manufacture of H_2 is:

Which catalyst is used in contact process of manufacturing of H_2SO_4 ?