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Anodes need do be replaced from time to ...

Anodes need do be replaced from time to time during the electrolysis of alumina

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i.During the electrolysis of alumina, oxygen gas is liberated at the anode.
ii. Oxygen reacts with the graphite anode to form carbon dioxide.
iii. Thus, the mass of graphite rods decrease over the time. Hence, anodes need to be replaced from time to time during the electrolysis of alumina.
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