Which of the following is not an example of intrinsic
(lyophilic) colloids?

Options

A. Gelatin
B. Albumin
C. Starch
D. Sol of gold

Answer

To determine which of the following is not an example of intrinsic (lyophilic) colloids, we need to first understand what intrinsic (lyophilic) colloids are.

### Step 1: Define Lyophilic Colloids
Lyophilic colloids, also known as intrinsic colloids, are colloidal systems that have an affinity for the dispersing medium (usually a liquid). They are often referred to as "liquid-loving" colloids. These colloids can easily dissolve in the solvent due to the presence of functional groups that can interact with the solvent molecules, typically forming hydrogen bonds.

### Step 2: Analyze the Given Options
The options provided are:
1. Gelatin
2. Albumin
3. Starch
4. Gold sol

Now, let's analyze each option:

- **Gelatin**: This is a protein derived from collagen and is known to be lyophilic because it can easily dissolve in water due to its functional groups.

- **Albumin**: This is another protein that is soluble in water and is also considered a lyophilic colloid due to its ability to form hydrogen bonds with water.

- **Starch**: This is a polysaccharide that is also soluble in water, making it a lyophilic colloid as it can interact with water molecules.

- **Gold sol**: This is a colloidal solution of gold particles in water. Gold sol does not have functional groups that can interact with water in the same way as the other options. Therefore, it does not have an affinity for the dispersing medium and is considered a lyophobic colloid (liquid-hating).

### Step 3: Conclusion
From the analysis, we can conclude that the option that is not an example of intrinsic (lyophilic) colloids is **Gold sol**.

### Final Answer:
**Gold sol** is not an example of intrinsic (lyophilic) colloids.

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