Question

The metal ion(s) which is/are not precipitated when $H_{2}S$ is passed with $HCl$ is/are :

• A. $Z{n}^{2+}$
• B. $N{i}^{2+}$
• C. $C{d}^{2+}$
• D. $M{n}^{2+}$

Answer 1

Answer: (A), (B), (D)

$Z{n}^{2+}$
$N{i}^{2+}$
$M{n}^{2+}$

$H_{2}S$ in presence of $HCl$ is the reagent used to identify the group2 basic radical like $C{d}^{2+}$,$P{b}^{2+}$,$H{g}^{2+}$,$B{i}^{3+}$,$S{b}^{3+}$ etc...)
$Z{n}^{2+}$,$N{i}^{2+}$ and $M{n}^{2+}$
are group4 basic radicals which were identified by using the reagent $H_{2}S$ in presence of $N{H}_{4}OH$.
So the metal ion(s) which is/are not precipitated when $H_{2}S$ is passed with $HCl$ are $Z{n}^{2+}$,$N{i}^{2+}$ and $M{n}^{2+}$.
Hence options A,B & D are correct.