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Wood : Charcoal : :Coal : ?

  • A.Fire
  • B.Smoke
  • C.Coke
  • D.Ash

Answer: C

Correct answer: Coke

The relation is fuel : what remains when it is heated without air. Wood so treated leaves charcoal; coal so treated leaves coke, the volatile matter having been driven off in both cases. Ash is what is left after burning with air.

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