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Question

Extraction of aluminium from oxide (Al2O3) is best done by:

A
Electrolytic reduction of Al2O3
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B
Reduction of Al2O3 with carbon
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C
Reduction of Al2O3 with sodium
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D
Reduction of Al2O3 with CO
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Solution

The correct option is A Electrolytic reduction of Al2O3
Electrolytic reduction of alumina: Pure alumina melts at about 2000oC and is a bad conductor of electricity. If fused cryolite and fluorspar are added, the mixture melts at 900oC and Al2O3 becomes a good conductor of electricity. Metallic Al is liberated at the cathode. So extraction of Al2O3 is best done by electrolytic reduction.

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