Which of the following on heating does not give nitrogen gas ?

Options

A. `NH_(4)NO_(3)`
B. `NH_(4)NO_(2)`
C. `Ba(N_(3))_(2)`
D. `(NH_(4))_(2)Cr_(2)O_(7)`

Explanation

To solve the question of which compound does not produce nitrogen gas upon heating, we will analyze each of the given options step by step.

### Step 1: Analyze the first option (NH4NO3)
- **Heating NH4NO3 (Ammonium Nitrate)**:
- When ammonium nitrate is heated, it decomposes to form nitrous oxide (N2O) and water (H2O).
- The reaction can be represented as:
\[ 2 NH4NO3 \rightarrow N2O + 2 H2O \]
- **Conclusion**: This option produces nitrous oxide (N2O) and does not produce nitrogen gas (N2).

### Step 2: Analyze the second option (NH4NO2)
- **Heating NH4NO2 (Ammonium Nitrite)**:
- When ammonium nitrite is heated, it decomposes to produce nitrogen gas and water.
- The reaction can be represented as:
\[ NH4NO2 \rightarrow N2 + 2 H2O \]
- **Conclusion**: This option produces nitrogen gas (N2).

### Step 3: Analyze the third option (Ba(N3)2)
- **Heating Ba(N3)2 (Barium Azide)**:
- When barium azide is heated, it decomposes to produce barium and nitrogen gas.
- The reaction can be represented as:
\[ Ba(N3)2 \rightarrow Ba + 3 N2 \]
- **Conclusion**: This option produces nitrogen gas (N2).

### Step 4: Analyze the fourth option (NH4)2Cr2O7
- **Heating (NH4)2Cr2O7 (Ammonium Dichromate)**:
- When ammonium dichromate is heated, it decomposes to produce nitrogen gas and chromium(III) oxide along with water.
- The reaction can be represented as:
\[ (NH4)2Cr2O7 \rightarrow Cr2O3 + N2 + 4 H2O \]
- **Conclusion**: This option produces nitrogen gas (N2).

### Final Conclusion:
After analyzing all four options, we find that:
- **Option 1 (NH4NO3)** is the only compound that does not produce nitrogen gas upon heating. Instead, it produces nitrous oxide (N2O).

### Answer:
**Option 1: NH4NO3 does not give nitrogen gas upon heating.**

---