Which of the following catalyse is employed is contact process for the manufacture of sulphuric acid?

Options

A. Platinised asbestos
B. Vanadium pentoxide
C. Platinised asbestos or vanadium pentoxide `(V_(2)O_(5))` , temperature `673-723K` .
D. Finely divided iron, molybdenum as promoter, condi-tions, `200` bar pressure and `723-773K` temperature

Answer

C

Explanation

Contact process for the manufacture of sulphuric acid
`2SO_(2)(g)+O_(2)(g)rarr2SO_(3)(g)`
`SO_(2)(g)+H_(2)SO_(4)(aq.)rarrunderset("oleum")(H_(2)S_(2)O_(7)(l))`
`H_(2)S_(2)O_(7)(l)+H_(2)O(l)rarr2H_(2)SO_(4)(aq.)`
It is catalyzed by platinized asbentos or vanadium pentoxide.
Platinised asbestotos (temperature `573K`) catalyses Ostwald's process for the manufacture of nitric acid:
`4NH_(3)(g)+5O_(2)(g)rarr4NO(g)+6H_(2)O(g)`
`2NO(g)+O_(2)(g)rarr2NO_(2)(g)`
`4NO_(2)(g)+2H_(2)O(l)+O_(2)rarr4HNO_(3)(aq.)`
Finely, divided iron and molybdenum as promoter is used for Haber's process for the manufacture of ammonia:
`N_(2)(g)+3H_(2)(g)rarr2NH_(3)(aq.)`