Chemistry - Redox Reactions Question with Solution | TestHub

A 10 g mixture of $\mathrm{C}{\mathrm{u}}_2\mathrm{S}$ and $\mathrm{CuS}$ was treated with 300 ml of 0.5 M - $\mathrm{Mn}{\mathrm{O}}_4^{-}$ in acid solution producing $\mathrm{S}{\mathrm{O}}_2$, $\mathrm{C}{\mathrm{u}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{2+}$. The $\mathrm{S}{\mathrm{O}}_2$ was boiled off and the excess of $\mathrm{Mn}{\mathrm{O}}_4^{-}$ was titrated with 175 ml of 1 M - $\mathrm{F}{\mathrm{e}}^{2+}$ solution. The percentage of $\mathrm{CuS}$ in original mixture is (Cu = 64)