Question

Out of $C{u}^{2+}$, $N{i}^{2+}$, $C{o}^{2+}$, and $M{n}^{2+}$, of those that dissolve in $dil.HCl$, only one gives a precipitate when $H_{2}S$ is passed. Identify the corresponding other which do not gives precipitation.

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

Answer 1

Answer: (A), (C), (D)

The correct options are
A $N{i}^{2+}$
C $C{o}^{2+}$
D $M{n}^{2+}$

Option (A),(C),(D) are correct.
(B): $C{u}^{2+}$ gets precipitated by $H_{2}S$ gas in presence of $dil.HCl$.