give the scientific reason Anodes need to be replaced from time to time during the electrolysis of alumina
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During electrolysis of alumina, the oxygen liberated at the carbon anode reacts with graphite rods (carbon anode) and forms carbon dioxide. (2) As the anodes gets oxidised during electrolysis of alumina, they are continuously eroded. Hence, it is necessary to replace anodes from time to time.
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