State the electrode reaction at the respective electrodes during extraction of $A l$ from $A l_{2} O_{3}$ .

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Solution

$A l_{2} O_{3} \to 2 A l^{3 +} + 3 O^{2 -}$
At cathode:
$A l^{3 +} + 3 e^{-} \to A l$
at anode:
$2 O^{2 -} \to O_{2}$

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State the electrode reaction at the respective electrodes during extraction of Al from Al2O3.

Al2O3→2Al3++3O2−At cathode:Al3++3e−→Alat anode:2O2−→O2

State the electrode reaction at the respective electrodes during extraction of $A l$ from $A l_{2} O_{3}$ .

$A l_{2} O_{3} \to 2 A l^{3 +} + 3 O^{2 -}$
At cathode:
$A l^{3 +} + 3 e^{-} \to A l$
at anode:
$2 O^{2 -} \to O_{2}$