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JAMB Chemistry 1980 Question 50

Question 50

Electrolysis

Copper sulphate solution was electrolysed using the apparatus shown below. Which of the following changes are observed?

Diagram for this question
  1. A.The bulb lights and copper is deposited at both electrodes
  2. B.The bulb lights and copper is deposited at the anode and disappears from the cathode
  3. C.The bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
  4. D.The bulb lights and copper is deposited at the cathode and disappears from the anode
  5. E.The bulb lights but no additional changes are observed.
Show the answer and explanation

Answer: D (The bulb lights and copper is deposited at the cathode and disappears from the anode)

Explanation

With copper electrodes, Cu2+ ions are deposited as copper on the cathode while the copper anode dissolves to replace them. No oxygen is given off.