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Assertion (A): Splitting a given volume into several stirred tanks in series raises the conversion.
Reason (R): Only the last tank operates at the exit concentration, while the earlier ones work at higher concentrations.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

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 single stirred tank holds all its contents at the exit concentration, where the rate is lowest. Splitting the same volume into a cascade means the first tanks sit at higher concentrations and therefore higher rates, and only the last works at the exit condition - so the same volume does more work.

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