Discussion
Assertion (A): Vanadium pentoxide replaced platinum as the contact process catalyst.
Reason (R): It is far cheaper and much more resistant to poisoning by arsenic in the feed.
Answer: C
Both are true and the reason gives the two advantages: gas purification is still required, but the tolerance of the vanadium catalyst makes the process much less fragile than the platinum one was. Feed gas is still cleaned before the converter.
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