Nitrogen is obtained when `NaNO_2` reacts with

Options

A. `NH_(4) Cl`
B. `NH_(4) NO_(3)`
C. `(NH_(4))_(2) CO_(3)`
D. `NH_(4) OH`

Answer

To solve the question, we need to determine which compound, when reacted with sodium nitrite (NaNO2), will produce nitrogen gas (N2).

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactant given is sodium nitrite (NaNO2). We need to analyze the reactions with the provided options: NH4Cl, NH4NO3, NH4O2CO3, and NH4OH.

2. **Consider the Reaction with NH4Cl**:
- When sodium nitrite (NaNO2) reacts with ammonium chloride (NH4Cl), the reaction can be written as:
\[ \text{NaNO}_2 + \text{NH}_4\text{Cl} \rightarrow \text{NH}_4\text{NO}_2 + \text{NaCl} \]
- Here, ammonium nitrite (NH4NO2) is formed.

3. **Decomposition of Ammonium Nitrite**:
- Ammonium nitrite (NH4NO2) is unstable and decomposes upon heating:
\[ \text{NH}_4\text{NO}_2 \rightarrow \text{N}_2 + 2\text{H}_2\text{O} \]
- This reaction produces nitrogen gas (N2) and water (H2O).

4. **Analyze Other Options**:
- **NH4NO3 (Ammonium Nitrate)**: This compound does not produce nitrogen gas when reacted with NaNO2.
- **NH4O2CO3 (Ammonium Carbonate)**: This compound also does not liberate nitrogen gas when reacted with NaNO2.
- **NH4OH (Ammonium Hydroxide)**: Similar to the others, it does not produce nitrogen gas when reacted with NaNO2.

5. **Conclusion**: The only compound that reacts with sodium nitrite to liberate nitrogen gas is ammonium chloride (NH4Cl).

### Final Answer:
Nitrogen is obtained when NaNO2 reacts with **NH4Cl**.