Which of the following is not shown by sols? 

Options

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

Answer

To determine which of the following is not shown by sols, we need to analyze each option in relation to the properties of colloidal solutions (sols).

### Step-by-Step Solution:

1. **Understanding Sols**:
- Sols are colloidal systems where solid particles are dispersed in a liquid medium. They exhibit unique properties due to the small size of the dispersed particles.

2. **Option 1: Adsorption**:
- Adsorption is a surface phenomenon where particles adhere to the surface of another material. In colloidal systems, the solid particles can adsorb molecules from the surrounding liquid.
- **Conclusion**: Sols do exhibit adsorption.

3. **Option 2: Tyndall Effect**:
- The Tyndall effect occurs when light is scattered by colloidal particles in a dispersion. When a beam of light passes through a colloidal solution, the particles scatter the light, making the path of the light visible.
- **Conclusion**: Sols do exhibit the Tyndall effect.

4. **Option 3: Flocculation**:
- Flocculation is the process where colloidal particles aggregate to form flocs or flakes, either spontaneously or through the addition of a flocculating agent. This is a common behavior in colloidal systems.
- **Conclusion**: Sols do exhibit flocculation.

5. **Option 4: Paramagnetism**:
- Paramagnetism is a form of magnetism where certain materials are attracted to an external magnetic field. This property is not typically associated with colloidal solutions, as they do not exhibit magnetic properties like paramagnetism.
- **Conclusion**: Sols do not exhibit paramagnetism.

### Final Answer:
The option that is not shown by sols is **Option 4: Paramagnetism**.

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