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JAMB Chemistry 2005 Question 7

Question 7

Electrolysis

A concentrated solution containing H+, Cu2+, OH− and Cl− was electrolyzed using platinum electrodes. The ion that will be discharged at the cathode is

  1. A.Cu2+
  2. B.Cl−
  3. C.H+
  4. D.OH−
Show the answer and explanation

Answer: A (Cu2+)

Explanation

Cations go to the cathode. Cu2+ is lower than H+ in the electrochemical series, so it is discharged first as copper metal.