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Match each reactor with a characteristic property.
List I
A. CSTR
B. PFR
C. Batch
D. Semi-batch
List II
1. conditions changing with time, not position
2. uniform conditions equal to the exit stream
3. one reactant fed while none is withdrawn
4. a concentration gradient along its length

  • A.A-4, B-2, C-1, D-3
  • B.A-2, B-4, C-3, D-1
  • C.A-3, B-1, C-4, D-2
  • D.A-2, B-4, C-1, D-3

Answer: D

Correct answer: A-2, B-4, C-1, D-3

Each reactor is characterised by how composition varies. A CSTR is uniform and equal to the exit stream. A PFR has a gradient along its length and none across it. A batch reactor varies with time but not position, since it is well mixed and closed. A semi-batch has one reactant fed in while nothing is withdrawn, which is how a reaction with a dangerous exotherm or an unwanted side reaction is controlled.

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