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JAMB Chemistry 1987 Question 1

Question 1

Separation of Mixtures

A brand of ink containing cobalt (II), copper (II) and iron (II) ions can best be separated into its various components by

  1. A.fractional crystallization
  2. B.fractional distillation
  3. C.sublimation
  4. D.chromatography
Show the answer and explanation

Answer: D (chromatography)

Explanation

The coloured ions in ink move at different speeds through paper or another adsorbent, so chromatography separates them. The other methods cannot separate several dissolved coloured substances present in tiny amounts.