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During the extraction of aluminium by Ha...

During the extraction of aluminium by Hall-Heroult process at which electrode oxygen gas is liberated.

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(ii) `2Al_(2)O_(3)+3C rarr 4Al+3CO_(2)`
`Al_(2)O_(3)overset ("Electrolysis ") to 2Al^(3)+3O^(2)`
At Anode : `Al^(3+)+ 3e^(-) to Al`
At Cathode : `C+O^(2-) +2e^(-)to CO_(2)`
`CO+O^(2-)+2e ^(-) to CO_(2) uarr`
(iii) Oxygen gas is not liberated ,
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