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Three of the following are non-catalytic fluid solid reactions. Which is the odd one out?

  • A.roasting of a sulphide ore
  • B.combustion of a coal particle
  • C.reduction of iron ore by carbon monoxide
  • D.ammonia synthesis over an iron catalyst

Answer: D

The iron in ammonia synthesis is a catalyst and is not consumed, so the reaction is catalytic rather than a fluid solid reaction proper. The other three all transform the solid itself. A catalyst is regenerated each cycle.

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