Sublimation is used to purify:
Correct answer: C. Benzoic acid
- A. Ammonium sulphate
- B. Sodium chloride
- C. Benzoic acid
- D. Lead carbonate
Explanation
A is incorrect as ammonium sulphate is purified through centrifuging.B is incorrect as sodium chloride is purified by crystallization.C is correct as benzoic acid is purified through sublimation.D is incorrect as lead carbonate is purified through sulfation, desulfurization leaching, distillation and carbonization.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Sublimation and Distillation
Sublimation separates a sublimable solid from non-sublimable impurities by direct conversion between solid and vapour, followed by deposition. Distillation separates liquids through differences in boiling points, including simple, fractional, steam and vacuum distillation, and the choice depends on volatility, miscibility and thermal stability.
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