Which of the following is not oxidized by `O_(3)`?

Options

A. `Kl`
B. `FeSO_4`
C. `KMnO_4`
D. `K_(2)MnO_(4)`

Explanation

To determine which of the given compounds is not oxidized by ozone (O₃), we will analyze each option step by step.

### Step 1: Understanding Ozone as an Oxidizing Agent
Ozone (O₃) is a strong oxidizing agent. It can oxidize various substances, which means it can take electrons from them, leading to an increase in the oxidation state of the substance being oxidized.

### Step 2: Analyzing Each Compound
1. **KI (Potassium Iodide)**:
- When KI reacts with ozone, iodine (I) in KI is oxidized to iodine (I₂) or potassium periodate (KIO₄). This means KI can be oxidized by ozone.

2. **FeSO₄ (Iron(II) Sulfate)**:
- In acidic medium, Fe²⁺ in FeSO₄ can be oxidized to Fe³⁺ by ozone. Thus, FeSO₄ can also be oxidized by ozone.

3. **KMnO₄ (Potassium Permanganate)**:
- Manganese in KMnO₄ is in the +7 oxidation state, which is its maximum oxidation state. Since it cannot be oxidized further, KMnO₄ will not react with ozone.

4. **K₂MnO₄ (Potassium Manganate)**:
- K₂MnO₄ contains manganese in the +6 oxidation state. It can be oxidized by ozone to form KMnO₄ and other products. Therefore, K₂MnO₄ can be oxidized by ozone.

### Conclusion
From the analysis, the compound that is not oxidized by ozone is **KMnO₄**.

### Final Answer
The correct answer is **C) KMnO₄**.

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