Laughing gas is obtained when a mixture of `NH_(4)Cl` and …………is heated while nitrogen gas is obtained when a mixture of `NH_(4)Cl` and ………….is heated.

Answer

To solve the question regarding the production of laughing gas and nitrogen gas from the heating of ammonium chloride (NH₄Cl) with other substances, we can break it down into steps.

### Step-by-Step Solution:

1. **Identify Laughing Gas**:
- Laughing gas is chemically known as nitrous oxide, which has the formula N₂O.

2. **Determine the Reactant for Laughing Gas**:
- To produce laughing gas (N₂O), ammonium chloride (NH₄Cl) is heated with sodium nitrate (NaNO₃).
- The reaction can be summarized as:
\[ NH₄Cl + NaNO₃ \rightarrow N₂O + H₂O + NaCl \]

3. **Identify Nitrogen Gas**:
- Nitrogen gas is represented by the formula N₂.

4. **Determine the Reactant for Nitrogen Gas**:
- To produce nitrogen gas (N₂), ammonium chloride (NH₄Cl) is heated with sodium nitrite (NaNO₂).
- The reaction can be summarized as:
\[ NH₄Cl + NaNO₂ \rightarrow N₂ + H₂O + NaCl \]

5. **Final Answers**:
- Laughing gas is obtained when a mixture of NH₄Cl and **NaNO₃** is heated.
- Nitrogen gas is obtained when a mixture of NH₄Cl and **NaNO₂** is heated.

### Summary:
- **Laughing gas (N₂O)** is produced with **NaNO₃**.
- **Nitrogen gas (N₂)** is produced with **NaNO₂**.