Which of the following(s) when heated give nitrogen gas

Options

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

Explanation

To determine which of the given compounds produce nitrogen gas (N2) when heated, we can analyze each compound one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds mentioned in the question are:
- NH4 (Ammonium)
- H2O2 (Hydrogen Peroxide)
- Cr2O7 (Chromium(VI) Oxide)
- BAN3 (Barium Azide)
- NH4NO3 (Ammonium Nitrate)

2. **Analyze the Heating of Each Compound**:
- **NH4 + H2O2**: When heated, this compound decomposes to produce chromium(III) oxide (Cr2O3), nitrogen gas (N2), and water (H2O). Thus, it gives N2.
- **BAN3**: When heated, barium azide decomposes to produce barium (Ba) and nitrogen gas (N2). Thus, it also gives N2.
- **NH4NO3**: When heated, ammonium nitrate decomposes to produce nitrous oxide (N2O) and water (H2O). However, it can also decompose further to produce nitrogen gas (N2) under certain conditions.

3. **Conclusion**: Based on the analysis:
- **NH4 + H2O2** produces nitrogen gas (N2).
- **BAN3** produces nitrogen gas (N2).
- **NH4NO3** can produce nitrogen gas (N2) under certain conditions, but primarily produces N2O.

4. **Final Answer**: The compounds that give nitrogen gas when heated are:
- NH4 + H2O2
- BAN3
- NH4NO3 (conditionally)