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How is alumina converted to aluminium?

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How is alumina converted to aluminium?

(a) Heating

(b) Cooling

(c) Electrolytically using an aluminium smelting cell

(d) Adding coke

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This question is from Aluminum topic in chapter Metallurgical Industries of Chemical Technology

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Right answer is (c) Electrolytically using an aluminium smelting cell

Best explanation: Alumina is periodically reduced to aluminium by electrolysis. A molten cryolite bath is maintained at 1000°C. Reduction takes place at the graphite anodes.

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