Discussion
Assertion (A): The rate of a heterogeneous catalytic reaction is defined per unit mass of catalyst rather than per unit volume.
Reason (R): The reaction takes place on the catalyst surface rather than throughout the fluid.
Answer: B
Both are true and the reason gives the justification: doubling the fluid volume without adding catalyst does not double the rate, so volume is not the quantity the rate is proportional to. The catalyst is what the reaction actually needs.
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