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JAMB Chemistry 1988 Question 1

Question 1

Separation of Mixtures

In the experiment shown in the figure, solid ammonium chloride is heated at the closed end of a tube. Ammonium chloride crystals deposit on the walls of the tube as a result of

Diagram for this question
  1. A.evaporation
  2. B.recrystallization
  3. C.sublimation
  4. D.fractional precipitation.
Show the answer and explanation

Answer: C (sublimation)

Explanation

Ammonium chloride changes straight from solid to vapour on heating and back to solid on the cooler part of the tube, without melting. That is sublimation.