Among \( \mathrm{Fe^{3+}} \), \( \mathrm{Pb^{2+}} \), \( \mathrm{Cu^{2+}} \) and \( \mathrm{Mn^{2+}} \), identify the one that gets precipitated out while passing \( \mathrm{H_2S} \) in presence of \( \mathrm{NH_4OH} \) as group reagent. The highest possible oxidation state of the corresponding metal is:
