Which of the following compounds does give `N_(2)` on heating ?

Options

A. `NH_(4)NO_(2)`
B. `NH_(4)NO_(3)`
C. `NaN_(3)`
D. Both (A) and (C)

Explanation

To determine which of the following compounds gives nitrogen gas (N₂) upon heating, we will analyze each compound step by step.

### Step 1: Analyze NH₄NO₂ (Ammonium Nitrite)
When ammonium nitrite (NH₄NO₂) is heated, it decomposes to produce nitrogen gas (N₂) and water (H₂O). The balanced chemical equation for this reaction is:
\[ 2 \, \text{NH}_4\text{NO}_2 \rightarrow \text{N}_2 + 2 \, \text{H}_2\text{O} \]
Thus, NH₄NO₂ does produce nitrogen gas upon heating.

### Step 2: Analyze NH₄NO₃ (Ammonium Nitrate)
When ammonium nitrate (NH₄NO₃) is heated, it decomposes to produce nitrous oxide (N₂O) and water (H₂O). The balanced equation for this reaction is:
\[ 2 \, \text{NH}_4\text{NO}_3 \rightarrow \text{N}_2\text{O} + 2 \, \text{H}_2\text{O} \]
Therefore, NH₄NO₃ does not produce nitrogen gas (N₂) upon heating.

### Step 3: Analyze NaN₃ (Sodium Azide)
When sodium azide (NaN₃) is heated, it decomposes to produce sodium (Na) and nitrogen gas (N₂). The balanced equation for this reaction is:
\[ 2 \, \text{NaN}_3 \rightarrow 2 \, \text{Na} + 3 \, \text{N}_2 \]
Thus, NaN₃ does produce nitrogen gas upon heating.

### Conclusion:
From the analysis, we find that:
- NH₄NO₂ produces N₂ upon heating.
- NH₄NO₃ does not produce N₂ upon heating.
- NaN₃ produces N₂ upon heating.

Therefore, the compounds that give nitrogen gas (N₂) on heating are **NH₄NO₂ and NaN₃**.

### Final Answer:
The correct options are A (NH₄NO₂) and C (NaN₃).

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