In Hall-Heroult process $C O_{2}$ is released at ?

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Solution

The Hall Heroult process is the major industrial process for smelting aluminium. The aluminium reduction process is described as,
$2 A l_{2} O_{3} + 3 C ⟶ 4 A l + 3 C O_{2}$
Anode reaction $C_{(s)} + 20_{(l)}^{2 -} ⟶ {C O_{2}}_{(g)} + 4 e^{-}$
Cathode reaction $A l_{(l)}^{3 +} + 3 e^{-} ⟶ A l_{(l)}$
So, we can see that $C O_{2}$ is released at anode.

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