Consider the following list of regents: Acidified `K_(2)Cr_(2)O_(7)`, alkaline `KMnO_(4)`, `CuSO_(4)`, `H_(2)O_(2)`, `CI_(2)`, `O_(3)`, `HNO_(3)`, and `Na_(2)S_(2)O_(3)`. The total number of reagents that can oxidis aqueous `I^(Theta)` ion `I_(2)` is .....

Explanation

To determine the total number of reagents that can oxidize the aqueous iodide ion (I⁻) to iodine (I₂), we will analyze each reagent one by one.

### Step-by-Step Solution:

1. **Identify the Reagents**: The reagents listed are:
- Acidified K₂Cr₂O₇
- Alkaline KMnO₄
- CuSO₄
- H₂O₂
- Cl₂
- O₃
- HNO₃
- Na₂S₂O₃

2. **Acidified K₂Cr₂O₇**:
- Potassium dichromate (K₂Cr₂O₇) is a strong oxidizing agent in acidic medium.
- Reaction: 6KI + K₂Cr₂O₇ + 7H₂SO₄ → 3I₂ + 4K₂SO₄ + Cr₂(SO₄)₃ + 7H₂O
- **Conclusion**: Can oxidize I⁻ to I₂.

3. **Alkaline KMnO₄**:
- Potassium permanganate (KMnO₄) is a strong oxidizing agent, but in alkaline medium, it oxidizes iodide to iodate (KIO₃) instead of I₂.
- **Conclusion**: Cannot oxidize I⁻ to I₂.

4. **CuSO₄**:
- Copper(II) sulfate (CuSO₄) can act as an oxidizing agent.
- Reaction: 4KI + CuSO₄ → 2CuI + I₂ + 2K₂SO₄
- **Conclusion**: Can oxidize I⁻ to I₂.

5. **H₂O₂**:
- Hydrogen peroxide (H₂O₂) is a good oxidizing agent.
- Reaction: 2KI + H₂O₂ → I₂ + 2KOH
- **Conclusion**: Can oxidize I⁻ to I₂.

6. **Cl₂**:
- Chlorine gas (Cl₂) is a strong oxidizing agent.
- Reaction: 2KI + Cl₂ → 2KCl + I₂
- **Conclusion**: Can oxidize I⁻ to I₂.

7. **O₃**:
- Ozone (O₃) is also a strong oxidizing agent.
- Reaction: 2KI + O₃ + H₂O → I₂ + 2KOH + O₂
- **Conclusion**: Can oxidize I⁻ to I₂.

8. **HNO₃**:
- Nitric acid (HNO₃) is a strong oxidizing agent.
- Reaction: 6KI + 4HNO₃ → 3I₂ + 4KNO₃ + 2H₂O + 2NO
- **Conclusion**: Can oxidize I⁻ to I₂.

9. **Na₂S₂O₃**:
- Sodium thiosulfate (Na₂S₂O₃) is a reducing agent and cannot oxidize iodide ions.
- **Conclusion**: Cannot oxidize I⁻ to I₂.

### Summary of Findings:
- The reagents that can oxidize I⁻ to I₂ are:
1. Acidified K₂Cr₂O₇
2. CuSO₄
3. H₂O₂
4. Cl₂
5. O₃
6. HNO₃

### Total Count:
- Total number of reagents that can oxidize I⁻ to I₂ = 6

### Final Answer:
The total number of reagents that can oxidize aqueous I⁻ ion to I₂ is **6**.

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