Test:212 QNo:5

A 10 g mixture of CuS and Cu2S was treated with 400 ml of 0.32 M KMnO4 in acidic medium producing SO2. The SO2 gas was boiled off and the excess KMnO4 was titrated with 80 ml of 1 M FeSO4 solution. Calculate the percentage composition of copper in the mixture.

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