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During the electrolytic production of al...

During the electrolytic production of aluminium , the carbon anodes are replaced from time to time because

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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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