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JAMB Chemistry 1988 Question 23

Question 23

Electrolysis

Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution?

  1. A.Cu2+(aq) + 2e− → Cu(s)
  2. B.2Cl− − 2e− → Cl2
  3. C.Cu(s) − 2e− → Cu2+(aq)
  4. D.Cu2+(aq) + 2Cl−(aq) → CuCl2(aq).
Show the answer and explanation

Answer: A (Cu2+(aq) + 2e− → Cu(s))

Explanation

The cathode supplies electrons, so reduction happens there: Cu2+ ions gain electrons and copper is deposited. Chlorine is released at the anode.