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Direct current is passed through a copper sulphate solution using platinum electrodes. The ions liberated at the electrodes are

1. copper at anode and sulphur at cathode
2. sulphur at anode and copper at cathode
3. oxygen at anode and copper at cathode
4. copper at anode and oxygen at cathode

Correct answer: oxygen at anode and copper at cathode

Solution

In the electrolysis of copper sulphate solution using platinum electrodes, copper ions (Cu²⁺) are reduced at the cathode to form copper metal, while water is oxidized at the anode to release oxygen gas.

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