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(i) What is the role of cryolite in the extraction of aluminium ?
(ii) What is the role of limestone in the extraction of iron from its oxides ?

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(i) It lowers the melting point of alumina `(Al_(2)O_(3))` and also makes it conducting.
(ii) It decomposes on heating to give CaO which acts as a basic flux and helps in the formation of slag.

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