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Assertion (A): A plug flow reactor gives a higher yield of a wanted intermediate than a stirred tank.
Reason (R): Every element in plug flow spends the same time in the reactor while a stirred tank spreads the times widely.

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

Answer: A

Both are true and the reason gives the mechanism: some material in a stirred tank leaves almost at once and some stays far too long, and both extremes lose the intermediate. A narrow residence time distribution is what helps.

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