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ChemistryNEET 2024Purification methods: crystallisation, distillation, chromatography

Purification and Characterisation of Organic Compounds

On heating, some solid substances change from the solid to the vapour state without passing through the liquid state. The technique used for the purification of such solid substances, based on the above principle, is known as:

  1. A.Sublimation✓
  2. B.Distillation
  3. C.Chromatography
  4. D.Crystallisation

Solution

A solid that passes directly to vapour on heating (e.g. camphor, naphthalene, ammonium chloride) is purified by sublimation: the vapour is condensed back to pure solid, leaving non-volatile impurities behind.

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