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a
98 % pure copper
b
95 % pure Zinc
c
Cu2S with little FeS
d
Iron containing 4 % copper
answer is C.
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Detailed Solution
Copper has greater affinity towards sulphur; Iron has greater affinity towards oxygen; During the extraction of copper from CuFeS2, the following reaction occurs2FeS + Cu2O→2FeO + Cu2S; FeO + SiO2→FeSiO3;FeO is removed as FeSiO3using SiO2Cu2S with little FeS left over is called copper matte which is further subjected to bessemerization.