Discussion
Assertion (A): Instantaneous selectivity and overall selectivity are different quantities.
Reason (R): The instantaneous value varies through the reactor while the overall value is an average of it.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the relation between them. The instantaneous value is local and varies with the composition and temperature at each point; the overall value is what actually leaves the reactor, and it is the flow-weighted average of the instantaneous values along the path. Designing for selectivity means arranging the reactor so that the instantaneous value stays high everywhere.
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