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JAMB Chemistry 1983 Question 11

Question 11

Separation of Mixtures

A mixture of common salt, ammonium chloride and barium sulphate can best be separated by

  1. A.addition of water followed by filtration then sublimation
  2. B.addition of water followed by sublimation then filtration
  3. C.sublimation followed by addition of water then filtration
  4. D.fractional distillation
  5. E.fractional crystallization
Show the answer and explanation

Answer: C (sublimation followed by addition of water then filtration)

Explanation

Heat first to sublime off the ammonium chloride (it would dissolve if water came first). Then add water: salt dissolves and insoluble barium sulphate is filtered off.