During the Hall-Heroult process of preparing Al metal from purified bauxite, if 3 moles of O2 is formed at anode the number of moles of Al formed at cathode is

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During the Hall-Heroult process of preparing Al metal from purified bauxite, if 3 moles of O₂ is formed at anode the number of moles of Al formed at cathode is

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answer is 4.

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Detailed Solution

$6 O^{2 -} ⟶ 3 O_{2} + 12 e^{-}$ and $4 {Al}^{3 +} + 12 e^{-} ⟶ 4 Al$ .

This shows that for every 3 moles of oxygen 4 moles Al is formed.

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