Which of the following is a non electrolytic colloidal sol

Options

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

Answer

To determine which of the following is a non-electrolytic colloidal sol, we need to understand the definition of a non-electrolyte and analyze each option provided.

### Step-by-Step Solution:

1. **Understand Non-Electrolytic Colloids:**
- A non-electrolytic colloid is a substance that does not dissociate into ions when dissolved in a solvent. This means that it remains as whole molecules and does not conduct electricity.

2. **Examine the Options:**
- We will look at each option provided to see if it is a non-electrolytic colloidal sol.

3. **Option 1: Starch**
- Starch is a polysaccharide and is classified as a lyophilic colloid. It does not dissociate into ions when placed in a solution. Therefore, starch is a non-electrolytic colloid.

4. **Option 2: Silver Chloride (AgCl)**
- Silver chloride is an ionic compound. When it is placed in a solution, it dissociates into silver ions (Ag⁺) and chloride ions (Cl⁻). Hence, it does not qualify as a non-electrolytic colloid.

5. **Option 3: Arsenic Sulfide (As₂S₃)**
- Arsenic sulfide is also an ionic compound. It will dissociate into arsenic ions and sulfide ions in a solution. Therefore, it is not a non-electrolytic colloid.

6. **Option 4: Antimony Sulfide (Sb₂S₃)**
- Similar to arsenic sulfide, antimony sulfide will dissociate into ions when placed in a solution. Thus, it is not a non-electrolytic colloid.

7. **Conclusion:**
- The only option that remains a non-electrolytic colloidal sol is **Starch**.

### Final Answer:
The correct answer is **Starch**.