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| In electrolysis of aluminum, why do we need to replace the anode frequently? |
They melt due to the high temperature The aluminum formed to be removed They are burnt away by oxygen with the carbon anode to form CO2 None of the above |
| They are burnt away by oxygen with the carbon anode to form CO2 |
| During electrolysis of alumina, the oxygen liberated at the carbon anode reacts with graphite rods (carbon anode) and forms carbon dioxide. As the anodes get oxidised during the electrolysis of alumina, they are continuously eroded. Hence, it is necessary to replace anodes from time to time. |
