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Get Answers to all your Questions
Write the role of
(i) NaCN in the extraction of gold from its ore.
(ii) Cryolite in the extraction of aluminium from pure alumina.
(iii) CO in the purification of Nickel.
Answers (1)
(i) Dilute NaCN is added as a reagent which selectively dissolves the gold on but not the impurities.
(ii) Cryolite decreases the melting point and increases conductivity.
(iii) CO helps to convert nickel to a volatile complex which is collected elsewhere and thin decomposed to give pure metal.
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