Contact process is used to convert `SO_2` into `SO_3` , in the pres ence of platinum catalyst and the reaction is exothermic.
`2SO_2(g)+O_2(g) Leftrightarrow 2SO_3(g)DeltaH=(-)ve`
Now-a-days a cheaper catalyst is used instead of plati- num and that catalyst is

Options

A. `V_2O_3` and `K_2O`
B. `V_2O_4` and `K_2O`
C. `V_2O_4` and `K_2O`
D. `VO_3` and `K_2O`

Answer

C