Select the positive sol in the following

Options

A. `Al(OH)_(3)` sol
B. Gold sol
C. CdS sol
D. Gum

Answer

To determine the positive sol from the given options, we need to analyze the nature of each compound mentioned. Here’s a step-by-step solution:

### Step 1: Understand the Types of Colloids
Colloids can be classified based on the charge of their particles. Positive sols have positively charged particles, while negative sols have negatively charged particles.

### Step 2: Analyze Each Compound
1. **Al(OH)3 (Aluminum Hydroxide)**:
- Aluminum hydroxide is a metal hydroxide. Generally, metal hydroxides form positive sols.

2. **Au (Gold)**:
- Gold is a metal and typically forms negative sols in colloidal form.

3. **CdS (Cadmium Sulfide)**:
- Cadmium sulfide is a metal sulfide, which usually forms negative sols.

4. **H2S (Hydrogen Sulfide)**:
- Hydrogen sulfide is a non-metal compound and also forms negative sols.

### Step 3: Conclusion
From the analysis, the only compound that forms a positive sol is **Al(OH)3** (Aluminum Hydroxide).

### Final Answer
The positive sol is **Al(OH)3**.

---