Which compound does not give oxygen on heating?

Options

A. HgO
B. `KMnO_(4)`
C. `(NH_(4))_(2)Cr_(2)O_(7)`
D. `KCIO_(3)`

Explanation

To determine which compound does not give oxygen on heating, we will analyze each of the given compounds one by one.

### Step-by-Step Solution:

1. **Analyze HgO (Mercury(II) oxide)**:
- When heated, HgO decomposes into mercury (Hg) and oxygen (O2).
- Reaction:
\[ 2 \text{HgO} \rightarrow 2 \text{Hg} + \text{O}_2 \]
- **Conclusion**: HgO gives oxygen upon heating.

2. **Analyze KMnO4 (Potassium permanganate)**:
- Upon heating, KMnO4 decomposes to form potassium manganate (K2MnO4), manganese dioxide (MnO2), and oxygen (O2).
- Reaction:
\[ 2 \text{KMnO}_4 \rightarrow \text{K}_2\text{MnO}_4 + \text{MnO}_2 + \text{O}_2 \]
- **Conclusion**: KMnO4 gives oxygen upon heating.

3. **Analyze NH4O2 (Ammonium peroxide)**:
- When heated, NH4O2 decomposes to produce nitrogen (N2) and water (H2O).
- Reaction:
\[ 2 \text{NH}_4\text{O}_2 \rightarrow \text{N}_2 + 4 \text{H}_2\text{O} \]
- **Conclusion**: NH4O2 does not produce oxygen upon heating.

4. **Analyze KClO3 (Potassium chlorate)**:
- Upon heating, KClO3 decomposes to form potassium chloride (KCl) and oxygen (O2).
- Reaction:
\[ 2 \text{KClO}_3 \rightarrow 2 \text{KCl} + 3 \text{O}_2 \]
- **Conclusion**: KClO3 gives oxygen upon heating.

### Final Answer:
The compound that does not give oxygen on heating is **NH4O2 (Ammonium peroxide)**.