What happens when a Lyophilic sol is added to a Lyophobic sol?

Options

A. Lyophobic sol is protected
B. Lyophilic sol is protected
C. Film of lyophilic sol is formed over lyophobic sol
D. Film of lyophobic sol is formed over lyophilic sol

Explanation

To understand what happens when a lyophilic sol is added to a lyophobic sol, let's break down the concepts and the interactions involved:

### Step-by-Step Solution:

1. **Define Lyophilic and Lyophobic Sols**:
- **Lyophilic Sol**: These are solvent-loving colloids. They have a strong affinity for the dispersion medium (solvent) and are generally stable. Examples include gelatin and starch.
- **Lyophobic Sol**: These are solvent-hating colloids. They have little affinity for the dispersion medium and are less stable. Examples include metal sols like gold or silver.

2. **Interaction Between Lyophilic and Lyophobic Sols**:
- When a lyophilic sol is introduced to a lyophobic sol, the lyophilic particles interact with the lyophobic particles. The lyophilic particles tend to surround the lyophobic particles.

3. **Formation of Protective Layer**:
- The lyophilic sol forms a protective layer around the lyophobic sol. This layer stabilizes the lyophobic sol and prevents it from coagulating or aggregating.

4. **Prevention of Electrolyte Entry**:
- The protective layer formed by the lyophilic sol also acts as a barrier against the entrance of electrolytes. This is important because electrolytes can destabilize the lyophobic sol, leading to coagulation.

5. **Conclusion**:
- Therefore, when a lyophilic sol is added to a lyophobic sol, the lyophobic sol is protected by a film of the lyophilic sol. This leads us to the conclusion that the correct options are:
- A) Lyophobic sol is protected.
- C) A film of lyophilic sol is formed over the lyophobic sol.

### Final Answer:
When a lyophilic sol is added to a lyophobic sol, the lyophobic sol is protected, and a film of lyophilic sol is formed over the lyophobic sol. The correct options are A and C.

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