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JAMB Chemistry 1989 Question 43

Question 43

Polymers

Vulcanization of rubber is a process by which

  1. A.isoprene units are joined to produce rubber
  2. B.rubber latex is coagulated
  3. C.sulphur is chemically combined in the rubber
  4. D.water is removed from the rubber.
Show the answer and explanation

Answer: C (sulphur is chemically combined in the rubber)

Explanation

In vulcanisation rubber is heated with sulphur, which forms cross-links between the chains, making the rubber harder and more elastic.