Ammonium compound which on heating does not give `NH_3` is

Options

A. `NH_4NO_2`
B. `(NH_4)_2CO_3`
C. `(NH_4)_2SO_4`
D. `NH_4Cl`

Answer

To solve the question, we need to identify which ammonium compound does not release ammonia (NH₃) when heated. Let's analyze each option step by step.

### Step 1: Analyze the first option - NH₄NO₂ (Ammonium nitrite)
- When NH₄NO₂ is heated, it decomposes to form nitrogen gas (N₂) and water (H₂O), but it does not produce ammonia (NH₃).
- The reaction can be represented as:
\[ 2 NH₄NO₂ \rightarrow N₂ + 2 H₂O \]
- Therefore, NH₄NO₂ does not give NH₃ upon heating.

### Step 2: Analyze the second option - (NH₄)₂CO₃ (Ammonium carbonate)
- When (NH₄)₂CO₃ is heated, it decomposes to produce ammonia (NH₃), carbon dioxide (CO₂), and water (H₂O).
- The reaction can be represented as:
\[ (NH₄)₂CO₃ \rightarrow 2 NH₃ + CO₂ + H₂O \]
- Therefore, (NH₄)₂CO₃ does produce NH₃ upon heating.

### Step 3: Analyze the third option - (NH₄)₂SO₄ (Ammonium sulfate)
- When (NH₄)₂SO₄ is heated, it decomposes to produce ammonium bisulfate (NH₄HSO₄) and ammonia (NH₃).
- The reaction can be represented as:
\[ (NH₄)₂SO₄ \rightarrow NH₄HSO₄ + NH₃ \]
- Therefore, (NH₄)₂SO₄ does produce NH₃ upon heating.

### Step 4: Analyze the fourth option - NH₄Cl (Ammonium chloride)
- When NH₄Cl is heated, it decomposes to produce ammonia (NH₃) and hydrogen chloride (HCl).
- The reaction can be represented as:
\[ NH₄Cl \rightarrow NH₃ + HCl \]
- Therefore, NH₄Cl does produce NH₃ upon heating.

### Conclusion
After analyzing all the options, we find that the only compound that does not produce ammonia when heated is **NH₄NO₂ (Ammonium nitrite)**.

Thus, the correct answer is:
**Option 1: NH₄NO₂**

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