Give reasons: (i) Name the method of refining of nickel. (ii) What is the role of cryolite in the extraction of alumin

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Q 2600167918.     Give reasons:
(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?
CBSE-12th 2016

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