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State the role of Graphite rod in the electrolytic reduction of alumina. |
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Answer» Solution :The electrolysis of the molten `Al_(2)O_(3)` is carried out in an electrolytic cell using graphite rods. The oxygen liberated at the ANODE REACTS with the carbon of the anode producing CO and `CO_2`. For each kilogram of aluminium produced, about `0.5kg` of the anode is burnt away. The electrode reactions are : `Al^(3+)+3e^(-) to Al "CATHODE "` `{:(C+O^(2-) to CO +2e^(-)),(C+2O^(2-) to CO_(2)+4e^(-)):}}" Anode "`. |
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