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10 g of a mixture of Cu2S and Cus was ti...

10 g of a mixture of `Cu_2S` and Cus was titrated with 200 " mL of " 0.75 M `MnO_4^(ɵ)` in acidic medium producing `SO_2,Cu^(2+)`, and `Mn^(2+)`. The `SO_2` was boiled off and the excess of `MnO_4^(ɵ)` was titrated with 175 " mL of " `1 M Fe^(2+)` solution. Find the percentage of CuS the in original mixture.

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