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Q.

Extraction of aluminium from aluminium oxide ( ${Al}_{2} O_{3}$ )is best done by

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a

electrolytic reduction of Al₂O₃

b

reduction of Al₂O₃ with carbon

c

reduction of Al₂O₃ with sodium

d

reduction of Al₂O₃ with CO

answer is A.

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Detailed Solution

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Melting point of pure Aluminia is 2000 ⁰C and is not a good conductor of electricity.
It is fused with cryolite and fluorspar to lower the melting point and improves conductivity.
At cathode metallic aluminium is liberated. Hence, extraction of aluminium from aluminium oxide Al₂O₃ is best done by electrolytic reduction of Al₂O₃.

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