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JAMB Chemistry 1989 Question 23

Question 23

Electrolysis

What is discharged at the cathode during the electrolysis of copper (II) tetraoxosulphate (VI) solution?

  1. A.Cu2+ only
  2. B.H+ only
  3. C.Cu2+ and H+
  4. D.Cu2+ and SO42−
Show the answer and explanation

Answer: A (Cu2+ only)

Explanation

Both Cu2+ and H+ move to the cathode, but copper is lower in the electrochemical series, so only Cu2+ is discharged as copper metal.