The movement of sol particles under an applied electric field is called

Options

A. electro deposition
B. electrodialysis
C. electro-osmosis
D. electrophoresis

Answer

To solve the question "The movement of sol particles under an applied electric field is called," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks about the movement of sol particles (which are colloidal particles) when an electric field is applied.

2. **Analyzing the Options**:
- We have four options to consider:
1. Electrodeposition
2. Electro-Dialysis
3. Electroosmosis
4. Electrophoresis

3. **Evaluating Option 1: Electrodeposition**:
- Electrodeposition (or electroplating) involves using electrical current to reduce metal cations from a solution to form a coherent metal.
- This process does not involve the movement of sol particles; rather, it focuses on metal ions depositing onto a surface.
- **Conclusion**: This option is not correct.

**Hint**: Electrodeposition is related to metal deposition, not the movement of colloidal particles.

4. **Evaluating Option 2: Electro-Dialysis**:
- Electro-Dialysis is a process that uses an electric field to speed up the dialysis of electrolytes.
- It helps in separating ions from a solution but does not specifically refer to the movement of sol particles.
- **Conclusion**: This option is also not correct.

**Hint**: Electro-Dialysis is about ion separation, not the movement of sol particles.

5. **Evaluating Option 3: Electroosmosis**:
- Electroosmosis refers to the movement of liquid (containing free charges) through a stationary charged solid under the influence of an electric field.
- Here, the solid particles do not move; instead, it is the liquid that moves.
- **Conclusion**: This option is not correct.

**Hint**: Electroosmosis involves liquid movement, not the movement of sol particles.

6. **Evaluating Option 4: Electrophoresis**:
- Electrophoresis is the process where charged particles in a solution move towards the electrodes when an electric field is applied.
- In this case, the sol particles (colloidal particles) carry charge and migrate towards the opposite electrodes (anode and cathode).
- **Conclusion**: This option is correct.

**Final Answer**: The movement of sol particles under an applied electric field is called **Electrophoresis**.