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An Intiative by Sri Chaitanya
a
Impure silver is treated with aqueous KCN in the presence of oxygen followed by reduction with zinc metal.
b
Calcination of Calamine produces Zincite.
c
Copper pyrites is heated with silica in a reverbaratory furnace to remove iron.
d
Roasting of Malachite produces Cuprite.
answer is B, C, D.
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