Which of the following compounds does not give `N_(2)`on heating?

Options

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

Answer

To determine which of the following compounds does not give nitrogen gas (N₂) upon heating, we will analyze each compound listed in the question:

1. **Sodium azide (NaN₃)**:
- When sodium azide is heated, it decomposes to form sodium (Na) and nitrogen gas (N₂).
- Reaction:
\[ 2 \text{NaN}_3 \rightarrow 2 \text{Na} + 3 \text{N}_2 \]
- Conclusion: This compound gives nitrogen gas upon heating.

2. **Ammonium sulfate (NH₄)₂SO₄**:
- Upon heating, ammonium sulfate decomposes to form ammonia (NH₃) and sulfuric acid (H₂SO₄).
- Reaction:
\[ (NH_4)_2SO_4 \rightarrow 2 \text{NH}_3 + H_2SO_4 \]
- Conclusion: This compound does not produce nitrogen gas upon heating.

3. **Ammonium nitrite (NH₄NO₂)**:
- When ammonium nitrite is heated, it decomposes to produce nitrogen gas (N₂) and water (H₂O).
- Reaction:
\[ NH_4NO_2 \rightarrow N_2 + 2 H_2O \]
- Conclusion: This compound gives nitrogen gas upon heating.

4. **Ammonium dichromate ((NH₄)₂Cr₂O₇)**:
- Upon heating, ammonium dichromate decomposes to produce nitrogen gas (N₂), chromium(III) oxide (Cr₂O₃), and water (H₂O).
- Reaction:
\[ (NH_4)_2Cr_2O_7 \rightarrow N_2 + Cr_2O_3 + 4 H_2O \]
- Conclusion: This compound gives nitrogen gas upon heating.

After analyzing all the compounds, we find that the only compound that does not produce nitrogen gas upon heating is **ammonium sulfate (NH₄)₂SO₄**.

### Final Answer:
The compound that does not give nitrogen (N₂) on heating is **ammonium sulfate (NH₄)₂SO₄**.

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