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JAMB Chemistry 1994 Question 1

Question 1

Separation of Mixtures

A mixture of sand, ammonium chloride and sodium chloride is best separated by

  1. A.sublimation followed by addition of water and filtration
  2. B.sublimation followed by addition of water and evaporation
  3. C.addition of water followed by filtration and sublimation
  4. D.addition of water followed by crystallization and sublimation
Show the answer and explanation

Answer: A (sublimation followed by addition of water and filtration)

Explanation

Heating first sublimes off the ammonium chloride. Adding water then dissolves the sodium chloride, and filtration removes the insoluble sand.