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in Chemistry by (138k points)

Explain the role of 
(i) Cryolite in the electrolytic reduction of alumina.
(ii) Carbon monooxide in the purification of nickel.

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(i) Role of cryolite
· It lowers the melting point of the mixture.
· It makes alumina a good conductor of electricity.
(ii) When nickel is heated with carbon monoxide it forms a volatile complex nickel tetracarbonyl which on further heating at higher temperature decomposes to give pure nickel.

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