The maximum power to precipitate arsenious suiphide is of

Options

A. `H_(2)SO_(4)`
B. `Na_(3)PO_(4)`
C. `CaCl_(2)`
D. `AlCl_(3)`

Answer

To determine the maximum power to precipitate arsenious sulfide (As₂S₃), we need to consider the charge of the cations in the electrolytes provided. The precipitation of arsenious sulfide occurs when negatively charged particles (colloids) are neutralized by positively charged ions (cations).

### Step-by-Step Solution:

1. **Identify the Nature of Arsenious Sulfide**:
- Arsenious sulfide is represented by the chemical formula As₂S₃. It is a negatively charged colloid.

2. **Understanding Coagulation**:
- Coagulation of negatively charged colloids requires the addition of positively charged ions (cations). The effectiveness of coagulation is directly proportional to the charge of the cation.

3. **Examine the Given Electrolytes**:
- We need to analyze the cations present in the given electrolytes:
- **H₂SO₄**: Contains 2 H⁺ ions (charge = +2).
- **Na₃PO₄**: Contains 3 Na⁺ ions (charge = +3).
- **CaCl₂**: Contains 1 Ca²⁺ ion (charge = +2).
- **AlCl₃**: Contains 1 Al³⁺ ion (charge = +3).

4. **Determine the Maximum Charge**:
- The effectiveness of precipitation is determined by the total positive charge of the cations:
- H₂SO₄: +2
- Na₃PO₄: +3
- CaCl₂: +2
- AlCl₃: +3
- The maximum positive charge is found in AlCl₃ and Na₃PO₄, both having a charge of +3.

5. **Conclusion**:
- Since both Na₃PO₄ and AlCl₃ have the same maximum charge, but AlCl₃ is often considered more effective in coagulation due to the trivalent nature of Al³⁺, the correct answer is AlCl₃.

### Final Answer:
The maximum power to precipitate arsenious sulfide is from AlCl₃.

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