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The molten metal, obtained after the treatment of copper pyrites in the blast furnace, has the composition of

$(a)\;CuS+Fe_2S_3 \\(b)\;CU_2S+Fe_2S_3 \\(c)\;CU_2S \\ (d)\;CU_2S+FeS$

The molten metal, obtained after the treatment of copper pyrites in the blast furnace, has the composition of $CU_2S+FeS$
Hence d is the correct answer.