Which statement is true regarding Hall-Heroult process.

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CO₂ liberated at anode and Al is obtained at cathode

CO₂ is liberated at cathode and Al is obtained at anode

O₂ is liberated at anode and Al is obtained at cathode

O₂ and CO₂ is liberated at anode and Al at cathode.

answer is A.

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Detailed Solution

Hall’s Heroult process, aluminum is extracted from alumina using electrolysis process where Al is obtained at cathode and carbon dioxide is obtained at anode.

${Al}^{3 +} + 3 e^{-} \to Al (Cathode) C + 2 O^{2 -} \to {CO}_{2} + 4 e^{-} (Anode)$

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