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Assertion (A): A refinery processing a heavy crude needs more conversion capacity than one processing a light crude.
Reason (R): A heavy crude yields a much larger fraction of residue on distillation.

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

Answer: D

Both are true and the reason gives the driver: light products are what the market wants, so the more residue a crude gives the more must be converted and the more the refinery costs to build. Coking and hydrocracking are the usual answers.

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