Question

In qualitative inorganic analysis of metal ions, the ion which precipitates as sulfide in the presence of H$_2$S in warm dilute HCl is

• A. Cr$^{3+}$
• B. Al$^{3+}$
• C. Co$^{2+}$
• D. Bi$^{3+}$

Hint:

In qualitative analysis, the precipitation of metal sulfides is used to identify ions in solution.

Answer 1

The Correct Option is D

Step 1: Analyzing the metal ions.
In qualitative inorganic analysis, H$_2$S in dilute HCl is used to precipitate metal ions as sulfides. Among the given ions, Co$^{2+}$ forms a precipitate as CoS.
Step 2: Conclusion.
The ion that precipitates as sulfide in the presence of H$_2$S in warm dilute HCl is Co$^{2+}$, corresponding to option (C).