Collidal solution is a heterogeneous solution which contains particle of intermediate size, i.e., (diameter between 1 and 1000 nm) colloidal is not a substance but it is a state of a substance which depends upon the molecular size. Colloidal solutions are intermediate between ture solution and suspensions.
The difference between a lyophilic and lyophobic colloid is their

Options

A. Behaviour towards dispersion medium
B. Filterability
C. Scattering of light
D. Particle size

Answer

To differentiate between lyophilic and lyophobic colloids, we can analyze their characteristics step by step.

### Step-by-Step Solution:

1. **Definition of Colloids**:
- A colloidal solution is a heterogeneous mixture containing particles with sizes ranging from 1 to 1000 nanometers. These particles are larger than those in true solutions but smaller than those in suspensions.

2. **Understanding Lyophilic and Lyophobic**:
- **Lyophilic Colloids**: The term "lyophilic" means "solvent-loving." These colloids have a strong affinity for the dispersing medium (solvent). They are stable and can easily form colloidal solutions upon mixing with the solvent.
- **Lyophobic Colloids**: The term "lyophobic" means "solvent-fearing." These colloids have little to no affinity for the dispersing medium. They tend to be less stable and require specific conditions (like the presence of stabilizers) to form colloidal solutions.

3. **Key Differences**:
- **Affinity for Dispersing Medium**:
- Lyophilic colloids exhibit a strong affinity for the dispersing medium.
- Lyophobic colloids exhibit a very low or almost zero affinity for the dispersing medium.
- **Stability**:
- Lyophilic colloids are generally more stable and can remain dispersed over time.
- Lyophobic colloids are less stable and can aggregate or settle out of the solution if not properly stabilized.

4. **Other Characteristics**:
- **Filterability**: Both types of colloids can pass through filter paper, so this is not a distinguishing characteristic.
- **Scattering of Light**: Both lyophilic and lyophobic colloids can scatter light, which is known as the Tyndall effect. This is also not a distinguishing factor.
- **Particle Size**: The particle size for both types of colloids is similar (1 to 1000 nm), so this does not differentiate them.

5. **Conclusion**:
- The primary difference between lyophilic and lyophobic colloids lies in their behavior towards the dispersing medium. Lyophilic colloids have a strong affinity for the medium, while lyophobic colloids do not.

### Final Answer:
The difference between a lyophilic and lyophobic colloid is their behavior towards the dispersing medium.