Among ${Fe}^{3 +},{Pb}^{2 +},{Cu}^{2 +}$ and ${Mn}^{2 +}$, identify the one that gets precipitated o

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Among ${Fe}^{3 +},{Pb}^{2 +},{Cu}^{2 +}$ and ${Mn}^{2 +}$, identify the one that gets precipitated out while passing $H_{2}	ext{ }S$ in presence of ${NH}_{4}OH$ as group reagent. The highest possible oxidation state of the corresponding metal is

Accepted Answer

Sol. [Key Concept: In the H$2$S/NH$4$OH (group IV) step MnS precipitates; manganese's highest oxidation state is $+ 7$.]Group IV reagent : ${NH}_{4}OH + H_{2}	ext{ }S$${Mn}^{+ 2}$ will be precipitated out and hence highest possible oxidation state of Mn is +7

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