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During the extraction of aluminium, cryolite and fluorspar are added to alumina. Why ?

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 During the extraction of aluminium, cryolite and fluorspar are added to alumina. Why ?

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Cryolite and fluorspar are added to alumina : 

(i) To lower the melting point of aluminium. 

(ii) To make alumina a good conductor of electricity. 

(iii) Cryolite acts as a solvent for alumina. 

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