Out of the following which does not liberate `N_2` gas on heating?

Options

A. `NaNO_2+NH_4Cl`
B. `O_3+NO`
C. `Ba(N_3)_2`
D. `NH_4NO_3`

Answer

To determine which of the given compounds does not liberate nitrogen gas (N₂) upon heating, we can analyze the reactions of each compound step by step.

### Step 1: Analyze the first reaction
**Reaction:** Sodium nitrite (NaNO₂) with ammonium chloride (NH₄Cl).

**Products:** Sodium chloride (NaCl), water (H₂O), and nitrogen gas (N₂).

**Conclusion:** This reaction liberates nitrogen gas.

### Step 2: Analyze the second reaction
**Reaction:** Ozone (O₃) with nitric oxide (NO).

**Products:** Nitrogen dioxide (NO₂) and oxygen gas (O₂).

**Conclusion:** This reaction does not liberate nitrogen gas.

### Step 3: Analyze the third reaction
**Reaction:** Heating barium azide (Ba(N₃)₂).

**Products:** Barium (Ba) and nitrogen gas (N₂).

**Conclusion:** This reaction liberates nitrogen gas.

### Step 4: Analyze the fourth reaction
**Reaction:** Heating ammonium nitrate (NH₄NO₃).

**Products:** Nitrous oxide (N₂O) and water (H₂O).

**Conclusion:** This reaction does not liberate nitrogen gas.

### Final Conclusion
From the analysis, the compounds that do not liberate nitrogen gas upon heating are:
- Ozone (O₃) with nitric oxide (NO)
- Ammonium nitrate (NH₄NO₃)

Thus, the correct options for the question are:
- Option B: O₃ + NO
- Option D: NH₄NO₃