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Molten cryolite is mixed with molten alu...

Molten cryolite is mixed with molten alumina in the extraction of aluminium by electrolysis. Why ? Name the substances that are used as anode and cathode in this method.

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(i) Molten cryolite acts as a solvent for alumina. Forms an electrolyte at low temperature.
(ii) High temperature electrolysis can be avioded, which prevents the loss of aluminium in the form of vapours.
(iii) Anode `rarr` Graphite rods
(iv) Cathode `rarr` Carbon lining.
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