Which are the properties of sols ?

Options

A. Adsorption
B. Tyndall effect
C. Floccuulation
D. Paramagnetism

Answer

To answer the question regarding the properties of sols, we will analyze each option provided: adsorption, Tyndall effect, flocculation, and paramagnetism.

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption refers to the process where molecules of a substance (adsorbate) adhere to the surface of another substance (adsorbent).
- In the context of sols, adsorption is a significant property as it involves the interaction between the colloidal particles and the surrounding medium.
- **Conclusion**: Adsorption is a property of sols.

2. **Understanding Tyndall Effect**:
- The Tyndall effect is the scattering of light by colloidal particles. This phenomenon occurs when a beam of light passes through a colloidal solution, making the path of the light visible.
- This effect is characteristic of colloidal solutions, including sols.
- **Conclusion**: The Tyndall effect is a property of sols.

3. **Understanding Flocculation**:
- Flocculation is the process where colloidal particles aggregate together to form flocs or clumps. This typically occurs when the stabilizing charges on the particles are neutralized, leading to their aggregation and eventual settling.
- Flocculation is a significant property of lyophobic sols, where stability is compromised leading to precipitation.
- **Conclusion**: Flocculation is a property of sols.

4. **Understanding Paramagnetism**:
- Paramagnetism is a property of materials that have unpaired electrons, which causes them to be attracted to magnetic fields.
- This property is not specific to colloidal solutions or sols; rather, it pertains to the electronic structure of certain materials.
- **Conclusion**: Paramagnetism is not a property of sols.

### Final Answer:
The properties of sols are:
- **Adsorption**
- **Tyndall Effect**
- **Flocculation**

Paramagnetism is not a property of sols.