Light scattering takes place in:

Options

A. Solutions of electrolyte
B. Colloidal sols
C. Electrodialysis
D. Electroplating

Answer

To determine where light scattering occurs, we need to understand the concept of the Tyndall effect, which is the scattering of light by particles in a colloid or in very fine suspensions. Let's analyze the options provided:

1. **Solution of Electrolyte**: Electrolyte solutions are typically homogeneous and do not contain large particles that can scatter light. Therefore, light scattering does not occur in these solutions.

2. **Colloidal Salts**: Colloidal solutions contain particles that are larger than those in a true solution but smaller than those in a suspension. These particles can scatter light, leading to the Tyndall effect. This means that light scattering does take place in colloidal salts.

3. **Electrodialysis**: This is a process used to separate ions in a solution using an electric field. It does not involve light scattering, as it does not create a colloidal suspension.

4. **Electroplating**: This is a process of depositing a layer of metal onto a surface using an electric current. It does not involve light scattering, as it does not create a medium that can scatter light.

Based on this analysis, the correct answer is that light scattering takes place in **colloidal salts**.

### Step-by-Step Solution:
1. **Understand the Tyndall Effect**: Recognize that light scattering is related to the Tyndall effect, which occurs when light passes through a colloidal solution.

2. **Analyze Each Option**:
- **Electrolyte Solution**: No light scattering occurs.
- **Colloidal Salts**: Light scattering occurs due to the presence of colloidal particles.
- **Electrodialysis**: No light scattering occurs.
- **Electroplating**: No light scattering occurs.

3. **Identify the Correct Option**: Conclude that the only option where light scattering occurs is **colloidal salts**.

### Final Answer:
Light scattering takes place in **colloidal salts**.