In Hall's process, in the production of Al, carbon is used as the anode material. The reactions are:

Anode:

A l^{3} + 3 e^{-} \to A l

Cathode:

C (s) + 2 O^{2 -} \to C O_{2} (s) + 4 e^{-}

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Anode:

C (s) + 2 O^{2 -} \to C O_{2} (s) + 4 e^{-}

Cathode:

A l^{3} + 3 e^{-} \to A l

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Anode:

A l \to A e^{3 +} + e^{-}

Cathode:

C O_{2} + 4 e^{-} \to C (s) + 2 O^{2}

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None of the above

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Solution

The correct option is C Anode: $C (s) + 2 O^{2 -} \to C O_{2} (s) + 4 e^{-}$
Cathode: $A l^{3} + 3 e^{-} \to A l$
In the production of Al (in Hall's process), reactions are:
Cathode:
$A l^{3 +} + 3 e^{-} \to A l$
Anode:
$2 O^{- 2} \to O_{2} + 4 e^{-}$
$C + O_{2} \to C O_{2}$

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