Discussion
Assertion (A): A supported catalyst uses far less active metal than an unsupported one for the same activity.
Reason (R): Dispersing the metal as small crystallites exposes far more of it as accessible surface.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Catalysis happens on the surface, so what matters is exposed metal atoms rather than metal mass. Dispersing platinum as crystallites a few nanometres across on a high area support puts a large fraction of the atoms at the surface, where a lump of the same metal would expose a vanishing fraction - which is why a vehicle catalyst uses grams rather than kilograms.
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