Question

Describe the role of the following :
(i) NaCN in the extraction of silver from a silver ore.
(ii) Cryolite in the extraction of aluminium from pure alumina. (All India 2009)
Answer:
(i) NaCN acts as a leaching agent or oxidising agent, thus oxidises Ag to Ag+ which then combines with CN– ions to form respective soluble complex.​

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