JEE Main 2026 — Apr 4, Shift 2 — Chemistry solution

JEE Main2026Apr 4, Shift 2Chemistry

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

A
+3
B
+4
C
+2
D
+7

Solution

The reagent H $_{2}$ S in presence of NH $_{4}$ OH (alkaline conditions) is the Group IV qualitative-analysis reagent. It precipitates Group IV sulfides such as MnS, NiS, CoS, ZnS.

From the listed cations:

Fe $^{3 +}$ — Group III (precipitates as Fe(OH) $_{3}$ with NH $_{4}$ OH alone).

Pb $^{2 +}$ — Groups I/II.

Cu $^{2 +}$ — Group II.

Mn $^{2 +}$ — Group IV, precipitates as MnS (flesh-coloured) under these conditions.

Highest possible oxidation state of Mn is +7 (as in MnO $_{4}^{-}$ , Mn $_{2}$ O $_{7}$ ).

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