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Describe the role of the following : ...

Describe the role of the following :
(i) NaCN in the extraction of silver ore.
(ii) Cryolite in the extraction of aluminium from pure alumina.

Text Solution

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Alumina `(Al_(2)O_(3))` is subjected to electrolytic reduction to give pure aluminium. Alumina is mixed with Cryolite `(Na_(3)AlF_(6))` which lowers its melting point and also increases the electrical conductivity of alumina, thereby facilitating the electrolytic reduction process.
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