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(i) Name the method of refining of nickel.

(ii) What is the role of cryolite in the extraction of aluminium ?

(iii) What is the role of limestone in the extraction of iron from its oxides

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(i) Mond's process.

(iii Cryolite acts as a solvent. The melting point of alumina is very high It is dissolved in cryolite which lowers the melting point and brings conductiy.

(iii) Limestone is decomposed to CaO, which removes the silica impurity of the ore as slag.

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