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Glycerol is purified by distillation under reduced pressure because it

  1. Ais immiscible with water
  2. Bis volatile in steam
  3. Cdecomposes at its normal boiling point
  4. Dhas a very low boiling point

Answer: C

Glycerol decomposes near its boiling point at atmospheric pressure. Lowering the pressure lowers the boiling temperature so that it distils without decomposition (vacuum distillation).
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