Butter is a colloidal solution of :

Options

A. Solid-solid
B. Liquid - solid
C. Solid-liquid
D. Gas - solid

Explanation

To determine the type of colloidal solution that butter represents, we can follow these steps:

### Step 1: Understand the Definition of Colloidal Solutions
A colloidal solution consists of particles that are larger than molecules but smaller than visible particles. These particles typically range in size from 1 to 1000 nanometers.

**Hint:** Recall that colloidal particles are not visible to the naked eye and require a microscope to be seen.

### Step 2: Identify the Components of a Colloidal Solution
A colloidal solution consists of two main components:
- **Dispersed Phase:** This is the substance that is dispersed (similar to the solute).
- **Dispersion Medium:** This is the substance in which the dispersed phase is distributed (similar to the solvent).

**Hint:** Think of the dispersed phase as the 'ingredient' that is mixed into the 'base' or medium.

### Step 3: Classify the Type of Colloid
Colloids can be classified based on the state of the dispersed phase and the dispersion medium:
- **Solid in Solid:** Called a solid sol (e.g., colored glasses).
- **Liquid in Solid:** Called a gel (e.g., butter, cheese).
- **Solid in Liquid:** Called a sol (e.g., paint).
- **Gas in Solid:** Called a solid foam (e.g., foam rubber).

**Hint:** Consider the physical state of butter to determine which category it falls into.

### Step 4: Analyze Butter
Butter is primarily composed of fat, which is a liquid at room temperature, dispersed in a solid medium. Therefore, butter fits the classification of a gel, where a liquid (fat) is dispersed in a solid medium (the structure of butter).

**Hint:** Think about the texture of butter and how it behaves when you spread it.

### Step 5: Conclusion
Based on the classification, we conclude that butter is a colloidal solution of the type "liquid in solid" (gel).

**Final Answer:** Butter is a colloidal solution of liquid in solid.