Column-I and Column-II contains four entries each. Entries of column-1 are to be matched with some entries of column-II. Each entry of column-I may have the matching with one or more than one entries of column -II
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Haemalite→Fe2O3 is purified by roasting, calcination, reduction with 'CO' as well as Carbon at different temperatures.
Bauxite and Carnallite are refined from calcination and electrolytic reduction.
Copper pyrites (CuFeS2) is purified by self-reduction and roasting.