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JAMB Chemistry 1991 Question 1

Question 1

Separation of Mixtures

Which of the following can be obtained by fractional distillation?

  1. A.Nitrogen from liquid air
  2. B.Sodium chloride from sea water
  3. C.Iodine from a solution of iodine in carbon tetrachloride
  4. D.Sulphur from a solution of sulphur in carbon disulphide.
Show the answer and explanation

Answer: A (Nitrogen from liquid air)

Explanation

Liquid air is a mixture of liquids with close boiling points (nitrogen −196°C, oxygen −183°C), which is exactly what fractional distillation separates.