Chemistry
JAMB 1980
Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?
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A.
The bulb lights and copper is deposited at both electrodes
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B.
the bulb lights and copper is deposited at the anode and disappears from the cathode
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C.
the bulb lights and copper is deposited at the cathode and oxygen liberated at the anode
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D.
the bulb lights and copper is deposited at the cathode and disappears from the anode
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E.
the bulb lights but no additional changes are observed
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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