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JAMB Chemistry 1995 Question 23

Question 23

Electrolysis

In the process of silver-plating a metal M, the metal M is the

  1. A.anode and a direct current is used
  2. B.cathode and an alternating current is used
  3. C.anode and an alternating current is used
  4. D.cathode and a direct current is used
Show the answer and explanation

Answer: D (cathode and a direct current is used)

Explanation

Silver ions are positive, so they are deposited on the negative electrode, the cathode. The current must be direct (one-way) so that M stays the cathode throughout.