During the extraction of aluminium by Hall-He'roult process,
i) Write a neat labeled diagram of the electrolytic cell.
ii) Write over all cell reaction.
iii) At which electrode oxygen gas is liberated?

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Solution

During the extraction of aluminium by Hall-He'roult process,
i) Neat labelled diagram of electrolytic cell is as shown.
ii) Over all cell reaction is $2 A l_{2} O_{3} + 3 C \to 4 ¨ A l + 3 C O_{2}$ .
iii) At anode oxygen gas is liberated.
$C + O^{2 -} \to C O + 2 e^{-}$
$C + 2 O^{2 -} \to C O_{2} + 4 e^{-}$
At cathode, Al is obtained.
$A l^{3 +} + 3 e^{-} \to A l$

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