Among the following, the number of compounds that can react with `PCl_(5)` to give `POCl_(3)` is `O_(2)`,`CO_(2)`,`SO_(2)`,`H_(2)O`,`H_(2)SO_(4)`,`P_(4)O_(10)`.

Explanation

To determine the number of compounds that can react with PCl₅ to give POCl₃, we will analyze each compound provided in the question:

1. **O₂ (Oxygen)**:
- Reaction: PCl₅ + O₂ → No reaction
- Conclusion: O₂ does not react with PCl₅ to form POCl₃.

2. **CO₂ (Carbon Dioxide)**:
- Reaction: PCl₅ + CO₂ → No reaction
- Conclusion: CO₂ does not react with PCl₅ to form POCl₃.

3. **SO₂ (Sulfur Dioxide)**:
- Reaction: PCl₅ + SO₂ → POCl₃ + SOCl₂
- Conclusion: SO₂ reacts with PCl₅ to produce POCl₃.

4. **H₂O (Water)**:
- Reaction (limited water): PCl₅ + H₂O → POCl₃ + HCl
- Conclusion: H₂O reacts with PCl₅ to produce POCl₃ only when present in limited quantity.

5. **H₂SO₄ (Sulfuric Acid)**:
- Reaction: PCl₅ + H₂SO₄ → 2 POCl₃ + SO₂Cl₂ + HCl
- Conclusion: H₂SO₄ reacts with PCl₅ to produce POCl₃.

6. **P₄O₁₀ (Tetraphosphorus Decaoxide)**:
- Reaction: PCl₅ + P₄O₁₀ → 10 POCl₃
- Conclusion: P₄O₁₀ reacts with PCl₅ to produce POCl₃.

Now, let's summarize the findings:
- Compounds that react with PCl₅ to give POCl₃: SO₂, H₂O (limited), H₂SO₄, and P₄O₁₀.
- Total number of compounds that can react with PCl₅ to give POCl₃: 4.

**Final Answer**: 4 compounds can react with PCl₅ to give POCl₃.