Among Fe^3+, Pb^2+, Cu^2+ and Mn^2+, identify the one that gets precipitated out while passing H_2 S in presence of NH_4 OH as group reagent. The…

Among $\displaystyle \mathrm{Fe}^{3+}, \mathrm{Pb}^{2+}, \mathrm{Cu}^{2+}$ and $\displaystyle \mathrm{Mn}^{2+}$, identify the one that gets precipitated out while passing $\displaystyle \mathrm{H}_2 \mathrm{~S}$ in presence of $\displaystyle \mathrm{NH}_4 \mathrm{OH}$ as group reagent. The highest possible oxidation state of the corresponding metal is