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JAMB Chemistry 1979 Question 4

Question 4

Redox Reactions

The reaction of zinc with copper (II) ions in aqueous solution can be represented as follows: Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(aq). Which of the following is the most complete description of this reaction?

  1. A.Copper (II) ions are being reduced.
  2. B.Zinc is being oxidized.
  3. C.Copper (II) ions and zinc are being reduced.
  4. D.Copper (II) ions and zinc are being oxidized
  5. E.Copper (II) ions are being reduced and zinc oxidized.
Show the answer and explanation

Answer: E (Copper (II) ions are being reduced and zinc oxidized.)

Explanation

Cu2+ gains two electrons (reduced) while Zn loses two electrons (oxidised). Only E describes both halves of the redox reaction.