A special type of diffusion when water is absorbed by solids , colloids causing increase in volume is called

Options

A. reverse osmosis
B. imbibition
C. Osmosis
D. Both A & B

Answer

To solve the question, we need to identify the term that describes the special type of diffusion when water is absorbed by solids or colloids, resulting in an increase in volume.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a specific type of diffusion related to the absorption of water by solids or colloids, which leads to an increase in volume.

2. **Analyzing the Options**:
- **Option A: Reverse Osmosis**: This process involves the movement of water through a semipermeable membrane, but it does not specifically refer to the absorption of water by solids or colloids.
- **Option B: Imbibition**: This term refers to the absorption of water by solids or colloids, leading to swelling and an increase in volume. It is commonly observed in dry seeds and wood when they absorb water.
- **Option C: Osmosis**: This is the movement of water across a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration. It does not specifically describe the absorption by solids or colloids.
- **Option D: Both A and B**: Since reverse osmosis does not apply to the absorption of water by solids or colloids, this option is incorrect.

3. **Identifying the Correct Answer**:
- Based on the analysis, the correct answer is **Option B: Imbibition**. This term specifically describes the process of water absorption by solids and colloids, resulting in an increase in volume.

### Final Answer:
The correct answer is **Imbibition**.