The values of colligative properties of colloidal solution are of small order in comparison to those shown by true solutions of same concentration because of colloidal particles …… .

Options

A. (A) exhibit enormous surface area
B. (B) remain suspended in the dispersion
C. (C) form lyophilic colloids
D. (D) are compartively less in number

Explanation

To solve the question regarding the colligative properties of colloidal solutions compared to true solutions, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Colligative Properties**:
- Colligative properties depend on the number of solute particles in a solution rather than their identity. These properties include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure.

2. **Comparing True Solutions and Colloidal Solutions**:
- In a true solution, the solute particles are typically small (molecular or ionic) and are present in larger numbers. This results in more significant changes in colligative properties.
- In a colloidal solution, the solute particles (colloidal particles) are larger than those in true solutions but are still dispersed in the solvent.

3. **Analyzing the Given Options**:
- **Option A**: Exhibit enormous surface area - While colloidal particles do have a large surface area, this does not directly relate to the number of particles affecting colligative properties.
- **Option B**: Remain suspended in the dispersion form - This describes the behavior of colloids but does not explain the difference in colligative properties.
- **Option C**: Lyophilic colloids - This refers to a type of colloid that interacts well with the solvent, but again, it does not address the number of particles.
- **Option D**: Are comparatively less in number - This option suggests that there are fewer colloidal particles compared to the number of particles in a true solution, which directly affects the colligative properties.

4. **Conclusion**:
- Since colligative properties depend on the number of solute particles, and colloidal solutions have fewer particles than true solutions, the values of colligative properties in colloidal solutions are indeed of a smaller order. Therefore, the correct answer is **Option D: are comparatively less in number**.