The fine particles of an insoluble substance uniformly dispersed throughout a gas or liquid is called

Options

A. suspension
B. precipitate
C. colloidal solution
D. impurity

Explanation

To solve the question, "The fine particles of an insoluble substance uniformly dispersed throughout a gas or liquid is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- We need to identify what is meant by "fine particles of an insoluble substance" and "uniformly dispersed throughout a gas or liquid."

2. **Identifying the Dispersed Phase and Dispersion Medium**:
- The "fine particles of an insoluble substance" represent the dispersed phase.
- The "gas or liquid" represents the dispersion medium.

3. **Recognizing the Type of Mixture**:
- When fine particles are uniformly dispersed in a medium, it indicates a specific type of mixture known as a colloidal solution.

4. **Defining Colloidal Solution**:
- A colloidal solution is a mixture where small particles (the dispersed phase) are evenly distributed throughout a continuous medium (the dispersion medium), which can be either a gas or a liquid.

5. **Eliminating Other Options**:
- **Suspension**: This is a heterogeneous mixture where particles are not uniformly distributed, so it does not fit the description.
- **Precipitate**: This refers to a substance that separates from a solution, which is not what we are looking for.
- **Impurity**: This refers to contaminants that affect the purity of a solution, which is also not relevant here.

6. **Conclusion**:
- Based on the definitions and characteristics of the mixtures, the correct answer is that the fine particles of an insoluble substance uniformly dispersed throughout a gas or liquid is called a **colloidal solution**.

### Final Answer:
The fine particles of an insoluble substance uniformly dispersed throughout a gas or liquid is called a **colloidal solution**.

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