Among the following , select the properties pf lyophilic coloidal sols :

Options

A. viscostiy same as that of the medium
B. extensive hydration takes place
C. particle migrate either towards cathode or anode in an electric field
D. particle can be readly detected under ultramicroscope

Answer

To determine the properties of lyophilic colloidal sols, we need to analyze the characteristics that define them. Here’s a step-by-step solution to the question:

### Step 1: Understanding Lyophilic Colloids
- **Definition**: Lyophilic colloids are colloidal systems where the dispersed phase has a strong affinity for the dispersion medium (solvent). The term "lyophilic" means "solvent-loving".

### Step 2: Evaluating Viscosity
- **Property**: The viscosity of lyophilic colloidal sols is not the same as that of the medium.
- **Conclusion**: This statement is incorrect. Thus, viscosity is not a property of lyophilic colloidal sols.

### Step 3: Hydration
- **Property**: Extensive hydration occurs in lyophilic colloidal sols due to their affinity for the solvent.
- **Conclusion**: This statement is correct. Lyophilic colloids undergo significant hydration, making them stable and well-dispersed in the solvent.

### Step 4: Behavior in Electric Field
- **Property**: Lyophilic colloids do not migrate towards the electrodes in an electric field.
- **Conclusion**: This statement is incorrect. Lyophilic colloids are stable and do not exhibit significant movement towards the electrodes, unlike lyophobic colloids.

### Step 5: Detection under Ultramicroscope
- **Property**: Lyophilic colloids are not readily detectable under an ultramicroscope due to their strong interaction with the solvent.
- **Conclusion**: This statement is also incorrect. Lyophilic colloids can be detected under an ultramicroscope due to their size and properties.

### Final Answer
- The correct property of lyophilic colloidal sols is that extensive hydration takes place.