Discussion
Assertion (A): A large Thiele modulus corresponds to a small effectiveness factor.
Reason (R): The reaction is fast relative to diffusion, so the reactant is consumed before it can penetrate.
Answer: A
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. A large modulus means the reaction is fast relative to diffusion, so reactant is consumed within a thin outer shell and the interior of the pellet sees almost none. The effectiveness factor - the actual rate divided by the rate if the whole pellet were at surface conditions - is correspondingly small, and most of the expensive catalyst inside is doing nothing.
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