Which of the following precipitate(s) does /do not dissolve in excess of ammonia solution ?

Options

A. `Zn(OH)_(2)`
B. `Ni(OH)_(2)`
C. `Al(OH)_(3)`
D. B and C both

Explanation

To determine which of the following precipitates do not dissolve in excess ammonia solution, we will analyze each option provided: Zinc Hydroxide, Nickel Hydroxide, and Aluminium Hydroxide.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- The compounds in question are:
- A) Zinc Hydroxide (Zn(OH)₂)
- B) Nickel Hydroxide (Ni(OH)₂)
- C) Aluminium Hydroxide (Al(OH)₃)

2. **Understand the Behavior with Ammonia**:
- Ammonia (NH₃) can act as a ligand and form complex ions with certain metal hydroxides, leading to the dissolution of the precipitate.

3. **Analyze Zinc Hydroxide**:
- When Zinc Hydroxide is treated with excess ammonia, it forms a soluble complex:
\[ Zn(OH)_2 + 4NH_3 \rightarrow [Zn(NH_3)_4](OH)_2 \]
- Therefore, Zinc Hydroxide **does dissolve** in excess ammonia.

4. **Analyze Nickel Hydroxide**:
- Nickel Hydroxide also reacts with excess ammonia to form a soluble complex:
\[ Ni(OH)_2 + 6NH_3 \rightarrow [Ni(NH_3)_6](OH)_2 \]
- Thus, Nickel Hydroxide **does dissolve** in excess ammonia.

5. **Analyze Aluminium Hydroxide**:
- Aluminium Hydroxide does not form a soluble complex with excess ammonia. It remains as a precipitate:
\[ Al(OH)_3 + excess \ NH_3 \rightarrow \text{No reaction} \]
- Therefore, Aluminium Hydroxide **does not dissolve** in excess ammonia.

6. **Conclusion**:
- Among the given options, the only compound that does not dissolve in excess ammonia solution is **Aluminium Hydroxide (Al(OH)₃)**.

### Final Answer:
The precipitate that does not dissolve in excess ammonia solution is **Aluminium Hydroxide (option C)**.