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

/ Chemical Process / By
Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively ?

A. V2O5 & Cr2O3.
B. Oxides of nitrogen & Cr2O3
C. V2O5 on a porous carrier & oxides of nitrogen
D. Oxides of nitrogen & V2O5 on a porous carrier