Which one of the following is correctly matched ?

Options

A. Aerosol-hair cream
B. Gel-butter
C. Foam-mist
D. Sol-whipped cream

Answer

To determine which of the given options is correctly matched, we need to analyze each option based on the definitions of the terms involved in surface chemistry.

### Step-by-step Solution:

1. **Understanding Aerosols**:
- An aerosol is a colloidal system where solid or liquid particles are dispersed in a gas. Common examples include mist and smoke.
- **Given Option**: Hair cream is mentioned as an aerosol. However, hair cream is a mixture of liquid in liquid (an emulsion) rather than a solid or liquid dispersed in a gas. Therefore, this option is incorrect.

2. **Understanding Gels**:
- A gel is a colloidal system where a liquid is dispersed in a solid. It can also be considered as a semi-solid that contains a liquid.
- **Given Option**: Gel in water is described. This is not a correct representation of a gel, as gels are typically solid-like structures with liquid trapped within them. Thus, this option is also incorrect.

3. **Understanding Foams**:
- A foam is a colloidal system where gas bubbles are dispersed in a liquid. Common examples include whipped cream and shaving foam.
- **Given Option**: Foam mist is mentioned. However, a foam mist is not a standard term in surface chemistry, and whipped cream is a foam, which is a correct representation. But since foam mist is not a recognized colloidal system, this option is incorrect.

4. **Understanding Emulsions**:
- An emulsion is a colloidal system where liquid droplets are dispersed in another liquid. Common examples include mayonnaise and milk.
- **Given Option**: Whipped cream is mentioned as an emulsion. Whipped cream is indeed a foam (gas in liquid) but can also be considered an emulsion due to the presence of fat droplets in the liquid cream. However, it is primarily classified as a foam, making this option incorrect as well.

5. **Final Evaluation**:
- After analyzing all options, none of the given options correctly match the definitions of the colloidal systems they are supposed to represent. However, if we consider the context of the question, the closest option that aligns with the definitions provided is the one related to whipped cream as it is a foam.

### Conclusion:
Based on the analysis, none of the options provided are correctly matched; however, if forced to choose, whipped cream as a foam could be considered the closest to being correct.