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JAMB Chemistry 1999 Question 6

Question 6

Separation of Mixtures

In the diagram above, the mixture of the two solids P and Q can be separated by

Diagram for this question
  1. A.distillation
  2. B.fractional distillation
  3. C.crystallization
  4. D.fractional crystallization
Show the answer and explanation

Answer: D (fractional crystallization)

Explanation

The graph shows two soluble solids whose solubilities differ and change with temperature. Such solids are separated by fractional crystallization: on cooling, the less soluble one crystallizes out first.