Mark the incorrect combination out of the following examples of colloidal solutions .

Options

A. `{:("Colloid","Dispresion medium","Dispered phase"),("Smoke","Gas","Solid"):}`
B. `{:("Colloid","Dispresion medium","Dispered phase"),("Mist","Gas","Liquid"):}`
C. `{:("Colloid","Dispresion medium","Dispered phase"),("Gel","Liquid","Liquid"):}`
D. `{:("Colloid","Dispresion medium","Dispered phase"),("Emulsion","Liquid","Liquid"):}`

Answer

To solve the question regarding the incorrect combination of colloidal solutions, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Colloidal Solutions**:
- A colloidal solution consists of two components: the dispersion medium and the disperse phase. The dispersion medium is the substance in which the particles are dispersed, while the disperse phase is the particles themselves.

2. **Analyzing Each Example**:
- **Smoke**:
- Dispersion Medium: Gas
- Disperse Phase: Solid
- This is a correct example of a colloidal solution.

- **Mist**:
- Dispersion Medium: Gas
- Disperse Phase: Liquid
- This is also a correct example of a colloidal solution.

- **Gel**:
- Dispersion Medium: Liquid
- Disperse Phase: Liquid
- This is incorrect because in a gel, the dispersion medium should be solid, and the disperse phase should be liquid.

- **Emulsion**:
- Dispersion Medium: Liquid
- Disperse Phase: Liquid
- This is a correct example of a colloidal solution.

3. **Identifying the Incorrect Combination**:
- From the analysis, the incorrect combination is with the gel, where the dispersion medium is incorrectly identified as liquid instead of solid.

### Conclusion:
The incorrect combination out of the given examples of colloidal solutions is **gel**, where the dispersion medium should be solid.

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