Match the items of Column I and Column II.
`{:("Column I","Column II"),("A. Dialysis ","1. Cleansing action of soap "),("B. Peptisation ","2. Coagulation"),("C. Emulsification ","3. Colloidal sol formation "),("D. Electrophoresis ","4. Purification"):}`

Explanation

To match the items from Column I with Column II, let's analyze each term step by step:

### Step-by-Step Solution:

1. **Dialysis**:
- **Definition**: Dialysis is a process used to purify colloidal particles or ions by passing them through a semi-permeable membrane.
- **Match**: This process is primarily for purification.
- **Answer**: A. Dialysis → 4. Purification

2. **Peptisation**:
- **Definition**: Peptisation involves the addition of a small electrolyte to a precipitate, which leads to the formation of a colloidal sol.
- **Match**: This process is associated with the formation of colloidal solutions.
- **Answer**: B. Peptisation → 3. Colloidal sol formation

3. **Emulsification**:
- **Definition**: Emulsification refers to the process of mixing two immiscible liquids (like oil and water) and is often facilitated by soaps or detergents to cleanse oily or greasy dirt.
- **Match**: This process is linked to the cleansing action of soap.
- **Answer**: C. Emulsification → 1. Cleansing action of soap

4. **Electrophoresis**:
- **Definition**: Electrophoresis is a technique that uses an electric field to move charged particles in a solution, leading to the coagulation of colloidal particles.
- **Match**: This process is related to coagulation.
- **Answer**: D. Electrophoresis → 2. Coagulation

### Final Matches:
- A. Dialysis → 4. Purification
- B. Peptisation → 3. Colloidal sol formation
- C. Emulsification → 1. Cleansing action of soap
- D. Electrophoresis → 2. Coagulation