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

JEE Main · 2026 · 04 Apr 2026 · Shift 2 · Practical and Analytical Chemistry

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 highest possible oxidation state of the corresponding metal is

Answer: (D)

Hydrogen sulphide passed in the presence of

N H_{4} OH

(a basic, ammoniacal medium) is the group reagent of the fourth analytical group. Of the ions listed,

F e^{3 +}

belongs to group III and

P b^{2 +}

and

C u^{2 +}

to group II, whereas

M n^{2 +}

is a group-IV cation and is precipitated as buff manganese sulphide under these conditions. Manganese reaches oxidation states up to

+ 7

, as in

KMn O_{4}

and

M n_{2} O_{7}

. The highest possible oxidation state of the precipitated metal is

+ 7

JEE Main · 2026 · 04 Apr 2026 · Shift 2 · Single correct option