Ammonia compound which upon heating does not give ammonia is:

Options

A. `(NH_4)_2SO_4`
B. `(NH_4)_2CO_3`
C. `NH_4 NO_2`
D. `NH_4Cl`

Explanation

To solve the question, "Ammonia compound which upon heating does not give ammonia is:", we need to analyze various ammonia compounds and their behavior when heated.

### Step-by-Step Solution:

1. **Identify the Compounds**: We need to consider common ammonia compounds such as:
- Ammonium sulfate (NH4)2SO4
- Ammonium carbonate (NH4)2CO3
- Ammonium nitrite (NH4NO2)
- Ammonium chloride (NH4Cl)
- Ammonium nitrate (NH4NO3)

2. **Analyze Heating Reactions**:
- **Ammonium sulfate (NH4)2SO4**: Upon heating, it decomposes to form ammonium bisulfate (NH4HSO4) and ammonia (NH3) is released.
- **Ammonium carbonate (NH4)2CO3**: When heated, it decomposes to form ammonia (NH3), carbon dioxide (CO2), and water (H2O).
- **Ammonium nitrite (NH4NO2)**: When heated, it decomposes to form nitrogen dioxide (NO2) and water (H2O), without releasing ammonia.
- **Ammonium chloride (NH4Cl)**: Upon heating, it releases ammonia (NH3) and hydrogen chloride (HCl).
- **Ammonium nitrate (NH4NO3)**: When heated, it decomposes to form nitrogen gas (N2), water (H2O), and oxygen (O2), without releasing ammonia.

3. **Conclusion**: From the analysis, we see that the only compound that does not release ammonia upon heating is **Ammonium nitrite (NH4NO2)**.

### Final Answer:
The ammonia compound which upon heating does not give ammonia is **Ammonium nitrite (NH4NO2)**.

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