The arsenious sulphide sol has negative charge. The maximum coagulating power for precipitating it is of 

Options

A. `0.1NZn(NO_(3))_(2)`
B. `0.1N Na_(3)PO_(4)`
C. `0.1NZnSO_(4)`
D. `0.1NAlCl_(3)`

Answer

To solve the question regarding the coagulating power for precipitating arsenious sulfide sol, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Charge of the Colloid**:
- The question states that arsenious sulfide sol has a negative charge. This means that to coagulate or precipitate this sol, we need to use a positively charged ion (cation).

2. **Understand Coagulating Power**:
- The coagulating power of a substance is related to the valency of the ions present in the coagulating agent. Generally, the higher the valency of the cation, the greater its ability to precipitate the negatively charged colloid.

3. **List the Given Options**:
- The options provided are:
- (a) 0.1N Zn(NO3)2
- (b) 0.1N Na3PO4
- (c) 0.1N ZnSO4
- (d) 0.0N AlCl3

4. **Determine the Valency of Each Cation**:
- For **Zn(NO3)2**: Zinc (Zn) has a valency of +2.
- For **Na3PO4**: Sodium (Na) has a valency of +1. Since there are three sodium ions, the overall contribution is +3, but we consider the individual ion's valency.
- For **ZnSO4**: Again, Zinc (Zn) has a valency of +2.
- For **AlCl3**: Aluminum (Al) has a valency of +3.

5. **Compare the Valencies**:
- Zn from Zn(NO3)2 and ZnSO4 has a valency of +2.
- Na from Na3PO4 has a valency of +1 (but there are three Na ions, making it +3 overall).
- Al from AlCl3 has a valency of +3.

6. **Identify the Maximum Coagulating Power**:
- Among the cations, Al (from AlCl3) has the highest valency of +3. Therefore, it has the maximum coagulating power for precipitating the negatively charged arsenious sulfide sol.

7. **Conclusion**:
- The answer to the question is that the maximum coagulating power for precipitating the arsenious sulfide sol is from **AlCl3**.

### Final Answer:
- The maximum coagulating power for precipitating arsenious sulfide sol is from **0.0N AlCl3**.

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