Which of these will not be oxidised by ozone

Options

A. KI
B. `FeSO_(4)`
C. `KMnO_(4)`
D. `K_(2)MnO_(4)`

Explanation

To determine which substance will not be oxidized by ozone (O3), we need to analyze the oxidation states of the elements in the given compounds and see if they can be further oxidized by ozone.

### Step-by-Step Solution:

1. **Understand the Role of Ozone**: Ozone (O3) is a strong oxidizing agent. It can oxidize various substances by increasing their oxidation states.

2. **Identify the Compounds**: The question implies that we are considering several compounds, including KI (potassium iodide), FeSO4 (iron(II) sulfate), and KMnO4 (potassium permanganate).

3. **Analyze KI (Potassium Iodide)**:
- In KI, iodine (I) is in the -1 oxidation state.
- Ozone can oxidize iodine from -1 to 0 (I2).
- Therefore, KI can be oxidized by ozone.

4. **Analyze FeSO4 (Iron(II) Sulfate)**:
- In FeSO4, iron (Fe) is in the +2 oxidation state.
- Ozone can oxidize iron from +2 to +3.
- Therefore, FeSO4 can also be oxidized by ozone.

5. **Analyze KMnO4 (Potassium Permanganate)**:
- In KMnO4, manganese (Mn) is in the +7 oxidation state.
- This is the maximum oxidation state for manganese.
- Ozone cannot oxidize manganese further because it is already in its highest oxidation state.
- Therefore, KMnO4 will not be oxidized by ozone.

6. **Conclusion**: Among the compounds considered, KMnO4 is the one that will not be oxidized by ozone.

### Final Answer:
KMnO4 (Potassium Permanganate) will not be oxidized by ozone.