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JAMB Chemistry 1979 Question 24

Question 24

Electrolysis

0.1 Faraday of electricity was passed through a solution of copper (II) sulphate. The maximum weight of copper deposited on the cathode would be (Cu = 64)

  1. A.64.0 g
  2. B.32.0 g
  3. C.16.0 g
  4. D.6.4 g
  5. E.3.2 g
Show the answer and explanation

Answer: E (3.2 g)

Explanation

Cu2+ + 2e− → Cu, so 2 F deposit 64 g. 0.1 F deposits 64 × 0.1/2 = 3.2 g.