Which of the following is a lyophobic colloidal solutution

Options

A. Aqueous starch solution
B. Aeuqous protein solution
C. Gold sol
D. Polymer solvent in some ogranic solvents

Answer

To determine which of the given options is a lyophobic colloidal solution, let's first understand the definitions and characteristics of lyophobic and lyophilic colloids.

### Step 1: Understand Lyophobic and Lyophilic Colloids
- **Lyophobic Colloids**: These colloids do not have an affinity for the dispersion medium. The dispersed phase (the particles) does not interact well with the solvent and tends to aggregate or settle out. Examples include metals like gold (Au) and silver (Ag), as well as metal hydroxides and metal sulfides.

- **Lyophilic Colloids**: These colloids have a strong affinity for the dispersion medium. The dispersed phase interacts well with the solvent, leading to stable colloidal solutions. Examples include starch, gelatin, and proteins.

### Step 2: Analyze the Options
Now, let's analyze the options provided in the question to identify which one is a lyophobic colloidal solution.

1. **Aqueous Starch Solution**: This is a lyophilic colloid because starch has a strong affinity for water.

2. **Aqueous Protein Solution**: Proteins are also lyophilic colloids due to their affinity for water.

3. **Gold Sol**: This is a lyophobic colloid because gold particles do not have an affinity for the dispersion medium (water).

4. **Metal Hydroxide**: Generally, metal hydroxides are considered lyophobic colloids.

5. **Metal Sulfide**: Metal sulfides are also typically classified as lyophobic colloids.

6. **Polymer Solvent in some Organic Solution**: Polymers in organic solvents can be lyophilic, depending on the specific polymer and solvent used.

### Step 3: Conclusion
From the analysis, the only option that qualifies as a lyophobic colloidal solution is **Gold Sol**.

### Final Answer
**Gold Sol** is a lyophobic colloidal solution.

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