Which of the following an reaction with `H_(2)S` will produce metal sulphide?

Options

A. `COCl_(2)`
B. `CuCl_(2)`
C. `[Cd(CN)_(4)]^(2-)`
D. `[Zn(OH)_(4)]^(2-)`

Explanation

To determine which of the given compounds will produce a metal sulfide when reacted with hydrogen sulfide (H₂S), we need to analyze each option provided.

### Step-by-step Solution:

1. **Identify the Compounds**: The options given are:
- A) COCl₂
- B) Cd(CN)₄²⁻
- C) Zn(OH)₂²⁻

2. **Analyze COCl₂**:
- COCl₂ is known as phosgene, which does not contain any metal. Therefore, it cannot react with H₂S to produce a metal sulfide.
- **Conclusion**: COCl₂ will **not** produce a metal sulfide.

3. **Analyze Cd(CN)₄²⁻**:
- This is a coordination complex containing cadmium (Cd) as the metal. When reacted with H₂S, the metal can potentially be replaced, but the presence of cyanide (CN⁻) ligands means that the metal is not free to react directly with H₂S to form a sulfide.
- **Conclusion**: Cd(CN)₄²⁻ will **not** produce a metal sulfide.

4. **Analyze Zn(OH)₂²⁻**:
- This is also a coordination complex where zinc (Zn) is the metal. Similar to the previous case, the hydroxide (OH⁻) ligands may prevent the direct formation of a metal sulfide when reacted with H₂S.
- **Conclusion**: Zn(OH)₂²⁻ will **not** produce a metal sulfide.

5. **Final Conclusion**:
- The only compound that has the potential to produce a metal sulfide when reacted with H₂S is COCl₂, but since it does not contain any metal, it cannot produce a metal sulfide.
- Therefore, none of the options provided will produce a metal sulfide when reacted with H₂S.

### Final Answer:
None of the given options will produce a metal sulfide when reacted with H₂S.