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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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(i) Na CN is used to form soluble complex of cyanide while impurities remain unaftected.
(ii) To make laumina a good conductor of electricity and to low down the melting point of both from 2323 k to 1140 k
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