Which of the following on heating does not given 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_(1)`

Answer

To determine which compound does not produce nitrogen gas upon heating, we will analyze the thermal decomposition of each given compound step by step.

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

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

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

### Step 4: Analyze NH4H2Cr2O7 (Ammonium Dichromate)
- When ammonium dichromate (NH4H2Cr2O7) is heated, it decomposes to produce nitrogen gas (N2), chromium(III) oxide (Cr2O3), and water (H2O).
- The reaction can be represented as:
\[ 2NH4H2Cr2O7 \rightarrow N2 + Cr2O3 + 4H2O \]
- **Conclusion**: NH4H2Cr2O7 produces nitrogen gas (N2) upon heating.

### Final Conclusion
Among the compounds analyzed, only **NH4NO3** does not produce nitrogen gas (N2) upon heating. Therefore, the answer to the question is:

**Answer: NH4NO3 (Ammonium Nitrate)**

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