Which is not shown by sols?

Options

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

Answer

To determine which property is not shown by sols (colloidal solutions), we can analyze the characteristics of colloids and the properties associated with them. Here’s a step-by-step solution:

### Step 1: Understand what sols are
Sols are colloidal solutions where solid particles are dispersed in a liquid. The size of these particles typically ranges from 1 nanometer to 1000 nanometers.

**Hint:** Remember that colloids consist of dispersed particles that are larger than molecules but smaller than visible particles.

### Step 2: Identify properties shown by sols
1. **Adsorption**: Sols can exhibit adsorption, where molecules adhere to the surface of the colloidal particles. This is a surface phenomenon.

**Hint:** Adsorption involves the accumulation of substances at the surface, not throughout the bulk.

2. **Tyndall Effect**: This effect occurs when light is scattered by the colloidal particles in a sol, making the path of the light visible. This is a characteristic of colloids.

**Hint:** The Tyndall effect is often observed when a beam of light passes through a colloidal solution, causing the light to scatter.

3. **Flocculation**: This refers to the process where colloidal particles aggregate to form flocs, often induced by the addition of electrolytes. This is also a property exhibited by sols.

**Hint:** Flocculation can be thought of as the clumping together of particles in a colloid.

### Step 3: Identify properties not shown by sols
4. **Paramagnetism**: This is a property of materials that are attracted to an external magnetic field. Sols do not exhibit paramagnetism as a general property because the dispersed particles in colloids do not typically possess the magnetic properties required for this behavior.

**Hint:** Paramagnetism is related to the presence of unpaired electrons in materials, which is not a characteristic of most colloidal particles.

### Conclusion
Based on the analysis, the property that is not shown by sols is **paramagnetism**.

**Final Answer:** Paramagnetism is not shown by sols.