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JAMB Chemistry 1993 Question 48

Question 48

Hydrocarbons

The function of the copper (II) tetraoxosulphate (VI) in dilute H2SO4 in the figure above is to

Diagram for this question
  1. A.dry the gas
  2. B.absorb phosphine impurity
  3. C.absorb ethene impurity
  4. D.form an acetylide with ethyne
Show the answer and explanation

Answer: B (absorb phosphine impurity)

Explanation

Ethyne made from calcium carbide contains phosphine (and hydrogen sulphide) impurities. Acidified copper(II) sulphate solution absorbs them.