Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively$?

V‚Äö√á√áO‚Äö√á√ñ & Cr‚Äö√á√áO‚Äö√á√â

Oxides of nitrogen & Cr‚Äö√á√áO‚Äö√á√â

V‚Äö√á√áO‚Äö√á√ñ on a porous carrier & oxides of nitrogen

Oxides of nitrogen & V‚Äö√á√áO‚Äö√á√ñ on a porous carrier

Catalyst used in the manufacture of sulphuric acid by chamber & contac

1.	Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively$?
A.	V‚Äö√á√áO‚Äö√á√ñ & Cr‚Äö√á√áO‚Äö√á√â
B.	Oxides of nitrogen & Cr‚Äö√á√áO‚Äö√á√â
C.	V‚Äö√á√áO‚Äö√á√ñ on a porous carrier & oxides of nitrogen
D.	Oxides of nitrogen & V‚Äö√á√áO‚Äö√á√ñ on a porous carrier
Answer» E.