Which of the following statement is/are correct regarding stability of sol ?
Lyophilic sols are stabilised due to a layer of solvent around sol particles.
(ii) Lyophobic sols are stabilised due to presence of charge.
(iii) Addition of lyophilic brings in more stability to lyophobic
(iv) Addition of lyophobic brings in more stability to lyophobic.

Options

A. (ii) only
B. (i) and (iv) only
C. (i), (ii) and (iii) only
D. All of these.

Explanation

To determine which statements regarding the stability of sols are correct, we will analyze each statement one by one.

1. **Statement (i)**: Lyophilic sols are stabilized due to a layer of solvent around sol particles.
- **Analysis**: This statement is correct. Lyophilic (solvent-loving) sols have a strong affinity for the solvent, which leads to the formation of a protective layer around the sol particles. This layer helps to stabilize the sol by preventing the particles from aggregating.

2. **Statement (ii)**: Lyophobic sols are stabilized due to the presence of charge.
- **Analysis**: This statement is also correct. Lyophobic (solvent-hating) sols do not have a strong affinity for the solvent and are stabilized primarily due to the presence of an electric charge on their particles. This charge creates a repulsive force between the particles, preventing them from coming together and aggregating.

3. **Statement (iii)**: Addition of lyophilic brings in more stability to lyophobic.
- **Analysis**: This statement is correct. The addition of lyophilic substances can stabilize lyophobic sols. Lyophilic particles can adsorb onto the surface of lyophobic particles, providing a protective layer and enhancing stability through solvation.

4. **Statement (iv)**: Addition of lyophobic brings in more stability to lyophobic.
- **Analysis**: This statement is incorrect. Adding more lyophobic substances does not enhance stability; in fact, it may lead to aggregation of the particles since they do not have a stabilizing effect and can promote coalescence.

**Conclusion**: The correct statements regarding the stability of sols are (i), (ii), and (iii).

### Summary of Correct Statements:
- (i) True: Lyophilic sols are stabilized due to a layer of solvent around sol particles.
- (ii) True: Lyophobic sols are stabilized due to the presence of charge.
- (iii) True: Addition of lyophilic brings in more stability to lyophobic.
- (iv) False: Addition of lyophobic does not bring in more stability to lyophobic.