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Delayed coking is applied to

  • A.gas oil, to raise up its octane number
  • B.vacuum residue, giving lighter products
  • C.light naphtha, to give off hydrogen
  • D.kerosene, to lower its freezing point

Answer: B

It is the refinery's way of dealing with the bottom of the barrel, converting material that nothing else will take. The coke is sold as fuel or, if the feed is clean enough, for anodes. It is the last resort for the heaviest material.

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