`H_(2)O` is oxidised to `O_(2)` by :

Options

A. `CIO_(2)`
B. `H_(2)O_(2)`
C. `H_(2)O`
D. `F_(2)`

Answer

To determine which substances can oxidize water (H₂O) to oxygen (O₂), we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - ClO₂
- **Reaction:** ClO₂ + H₂O
- **Observation:** ClO₂ does not dissolve in water and does not oxidize water to produce O₂.
- **Conclusion:** ClO₂ is **not** a suitable oxidizing agent for this reaction.

### Step 2: Analyze the second option - H₂O₂
- **Reaction:** H₂O₂ + H₂O
- **Observation:** Hydrogen peroxide (H₂O₂) can decompose to produce water and oxygen:
\[ 2 H₂O₂ \rightarrow 2 H₂O + O₂ \]
- **Conclusion:** H₂O₂ can oxidize water to produce O₂, making this option **correct**.

### Step 3: Analyze the third option - H₂O itself
- **Observation:** Since we are considering the oxidation of water to oxygen, using H₂O itself does not make sense.
- **Conclusion:** H₂O cannot oxidize itself to produce O₂, so this option is **not correct**.

### Step 4: Analyze the fourth option - F₂
- **Reaction:** F₂ + H₂O
- **Observation:** When fluorine reacts with water, it produces hydrofluoric acid (HF) and oxygen:
\[ 2 F₂ + 2 H₂O \rightarrow 4 HF + O₂ + O₃ \]
- **Conclusion:** F₂ can oxidize water to produce O₂, making this option **correct**.

### Final Conclusion:
The substances that can oxidize water (H₂O) to oxygen (O₂) are:
- **B. H₂O₂**
- **D. F₂**

### Summary of Correct Options:
- B (H₂O₂) and D (F₂) are the correct answers.

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