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Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes...

Chemistry
JAMB 1980

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

  • A. The bulb lights and copper is deposited at both electrodes
  • B. the bulb lights and copper is deposited at the anode and disappears from the cathode
  • C. the bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
  • D. the bulb lights and copper is deposited at the cathode and disappears from the anode
  • E. the bulb lights but no additional changes are observed
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Correct Answer: Option D
Explanation

Copper electrodes are chemically related to CuSO4

Anode: \(Cu^{2+}\) → Cu  + 2e

Cathode: \(Cu^{2+}\) + 2e- → Cu

The anode gets thinner, the cathode gets thicker, and work is done in the external circuit to light the bulb.

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