The separation of colloidal particles from the particles having molecular dimensions by electricity is known as

Options

A. electrolysis
B. electrophoresis
C. Electrodialysis
D. electroosmosis

Answer

To solve the question regarding the separation of colloidal particles from particles having molecular dimensions by electricity, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Colloidal and Molecular Dimensions**:
- Colloidal particles are larger than molecular dimensions but smaller than visible particles. They typically range from 1 nm to 1000 nm in size.
- Particles with molecular dimensions are much smaller, usually less than 1 nm.

2. **Identifying the Separation Method**:
- The question asks for a method that uses electricity to separate these two types of particles.
- The process that fits this description is known as **electrodialysis**.

3. **Process of Electrodialysis**:
- In electrodialysis, a colloidal solution is placed in a container that has a semi-permeable membrane.
- This membrane allows certain ions to pass through while blocking colloidal particles.

4. **Setting Up the Electrodes**:
- Electrodes (anode and cathode) are placed in compartments adjacent to the colloidal solution.
- When an electric current is applied, ions in the colloidal solution migrate towards the oppositely charged electrodes.

5. **Separation of Particles**:
- As the ions move towards the electrodes, the colloidal particles remain trapped by the membrane, effectively separating them from the smaller particles that can pass through.
- This results in the removal of colloidal particles from the solution.

6. **Conclusion**:
- Therefore, the separation of colloidal particles from particles having molecular dimensions by electricity is known as **electrodialysis**.

### Final Answer:
The separation of colloidal particles from the particles having molecular dimensions by electricity is known as **electrodialysis**.

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