Give scientific reasons
Anodes need to be replaced from time to time during the electrolysis of alumina.

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Solution

In the electrolysis of alumina, graphite rod is used as anode.

During the electrolytic reduction of alumina, aluminium is produced at the cathode and oxygen gas is evolved at the anode.

This gas reacts with the graphite rods (anode) and forms carbon dioxide.

Thus, the graphite rods are continuously eroded. Hence, the graphite rods i.e. anodes be replaced from time to time during the electrolysis of fused alumina.

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Give scientific reasons Anodes need to be replaced from time to time during the electrolysis of alumina.

Give scientific reasons
Anodes need to be replaced from time to time during the electrolysis of alumina.