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In the extraction of aluminium by electr...

In the extraction of aluminium by electrolysis.
(i) Give the composition of the electrolyte used.
(ii) Over all reaction.
(iii) Role of cryolite.

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(i) `Al_(2)O_(3) + Na_(3)AlF_(6) + CaF_(2)` (ii) `2Al_(2)O_(3) + 3C rarr 4Al + 3CO_(2)`
(iii) Ir decreases the melting point of `Al_(2)O_(3)`.
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