Which of the following is a non electrolytic colloidal sol 

Options

A. Starch
B. `AgCl` sol
C. Arsenic sulphide sol
D. `Sb_(2)S_(3)` sol

Answer

To determine which of the given options is a non-electrolytic colloidal sol, we will analyze the properties of each substance mentioned.

### Step-by-Step Solution:

1. **Understand the Definition of Colloidal Sols**:
- Colloidal sols consist of two phases: the dispersed phase (particles) and the dispersion medium (liquid or gas).

2. **Identify the Given Options**:
- The options provided are starch, AgCl, arsenic sulfide (As2S3), and antimony sulfide (Sb2S3).

3. **Analyze Each Substance**:
- **Starch**:
- Starch is a natural polymer and is a covalent compound. It does not dissociate into ions in solution, making it a non-electrolytic colloidal sol.

- **AgCl (Silver Chloride)**:
- AgCl is a salt that can dissociate into Ag⁺ and Cl⁻ ions, albeit to a very small extent. Since it can produce ions in solution, it is classified as an electrolytic colloid.

- **Arsenic Sulfide (As2S3)**:
- Arsenic sulfide can dissociate into ions (As³⁺ and S²⁻) in solution, making it an electrolytic colloid.

- **Antimony Sulfide (Sb2S3)**:
- Similar to arsenic sulfide, antimony sulfide can also dissociate into ions (Sb³⁺ and S²⁻) in solution, categorizing it as an electrolytic colloid.

4. **Conclusion**:
- Among the options, only starch does not dissociate into ions and is therefore a non-electrolytic colloidal sol.

### Final Answer:
The non-electrolytic colloidal sol is **starch**.

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