Which of the following, when dissolved in water, will liberated ammonia?

Options

A. `NaNO_(3)`
B. `NaNO_(2)`
C. `NaNH_(3)`
D. `Na_(3)N`

Answer

To determine which of the given compounds will liberate ammonia when dissolved in water, we will analyze each compound's reaction with water step by step.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds to consider are Sodium Nitrate (NaNO3), Sodium Nitrite (NaNO2), Sodium Amide (NaNH2), and Sodium Azide (Na3N).

2. **Reaction of Sodium Nitrate (NaNO3)**:
- When NaNO3 is dissolved in water, it dissociates into Na⁺ and NO3⁻ ions.
- The reaction does not produce ammonia:
\[ \text{NaNO}_3 (s) \rightarrow \text{Na}^+ (aq) + \text{NO}_3^- (aq) \]
- **Conclusion**: No ammonia is liberated.

3. **Reaction of Sodium Nitrite (NaNO2)**:
- When NaNO2 is dissolved in water, it dissociates into Na⁺ and NO2⁻ ions.
- The reaction does not produce ammonia:
\[ \text{NaNO}_2 (s) \rightarrow \text{Na}^+ (aq) + \text{NO}_2^- (aq) \]
- **Conclusion**: No ammonia is liberated.

4. **Reaction of Sodium Amide (NaNH2)**:
- When NaNH2 is dissolved in water, it reacts with water to produce sodium hydroxide (NaOH) and ammonia (NH3):
\[ \text{NaNH}_2 (s) + \text{H}_2\text{O} (l) \rightarrow \text{NaOH} (aq) + \text{NH}_3 (g) \]
- **Conclusion**: Ammonia is liberated.

5. **Reaction of Sodium Azide (Na3N)**:
- When Na3N is dissolved in water, it reacts similarly to produce sodium hydroxide and ammonia:
\[ \text{Na}_3\text{N} (s) + \text{3H}_2\text{O} (l) \rightarrow \text{3NaOH} (aq) + \text{NH}_3 (g) \]
- **Conclusion**: Ammonia is liberated.

### Final Answer:
The compounds that liberate ammonia when dissolved in water are **Sodium Amide (NaNH2)** and **Sodium Azide (Na3N)**.