`As_(2)S_(3)` sol is ,

Options

A. postivie colloid
B. negative colloid
C. neutral colloid
D. none of the above

Answer

To determine the nature of the `As_(2)S_(3)` sol (arsenic sulfide sol), we will follow these steps:

### Step 1: Understanding the Preparation of Arsenic Sulfide Sol
Arsenic sulfide sol is prepared by the reaction of arsenic oxide with hydrogen sulfide. The balanced chemical equation for this reaction is:

\[ \text{As}_2\text{O}_3 + 3\text{H}_2\text{S} \rightarrow \text{As}_2\text{S}_3 + 3\text{H}_2\text{O} \]

### Step 2: Identifying the Charge of the Colloid
In colloidal solutions, the charge of the particles can be determined by the nature of the ions that are adsorbed on their surfaces. In the case of arsenic sulfide sol, it is known that the colloidal particles of arsenic sulfide tend to adsorb negatively charged ions.

### Step 3: Conclusion
Since the arsenic sulfide sol (`As_(2)S_(3)`) has a negative charge due to the adsorption of negatively charged ions, we can conclude that it is a negative colloid.

### Final Answer
The correct option is: **Negative colloid (Option 2)**.

---