`H_(2)S` is passed through as acidified solution of Ag, Cu and Zn. Which forms precipitate

Options

A. `Ag`
B. Zn
C. Cu
D. None of these

Explanation

To determine which of the metals (Ag, Cu, Zn) forms a precipitate when H₂S is passed through an acidified solution, we need to consider the solubility of their sulfides in acidic conditions.

### Step-by-step Solution:

1. **Identify the Metals and Their Sulfides**:
- Silver (Ag) forms silver sulfide (Ag₂S).
- Copper (Cu) forms copper(I) sulfide (Cu₂S) and copper(II) sulfide (CuS).
- Zinc (Zn) forms zinc sulfide (ZnS).

2. **Check the Solubility of Sulfides**:
- Ag₂S: Silver sulfide is insoluble in water and precipitates out when H₂S is introduced.
- CuS: Copper(II) sulfide is also insoluble in water and will precipitate out. However, Cu₂S is less common in acidic conditions.
- ZnS: Zinc sulfide is generally soluble in acidic solutions, so it will not precipitate.

3. **Conclusion**:
- When H₂S is passed through an acidified solution containing Ag, Cu, and Zn, the metals that will form precipitates are **Ag** (as Ag₂S) and **Cu** (as CuS). **Zn** does not form a precipitate.

### Final Answer:
**Ag and Cu will form precipitates when H₂S is passed through an acidified solution containing Ag, Cu, and Zn.**