Brownian movement is found in

Options

A. Colloidal sol
B. Solid suspensions
C. True solution
D. Unsaturated fatty acids

Answer

**Step-by-Step Solution:**

1. **Understanding Brownian Movement**: Brownian movement refers to the random, zigzag motion of particles suspended in a fluid (liquid or gas). This phenomenon is a result of collisions between the suspended particles and the molecules of the fluid.

2. **Historical Context**: The term "Brownian movement" is named after the British botanist Robert Brown, who first observed this motion in pollen grains suspended in water in 1827.

3. **Identifying the Medium**: Brownian movement is typically observed in colloidal solutions. Colloids are mixtures where tiny particles are dispersed throughout a continuous medium, and these particles are small enough to remain suspended and exhibit Brownian motion.

4. **Evaluating the Options**:
- **Option 1: Colloidal Solution**: This is the correct answer since Brownian motion is characteristic of colloidal particles.
- **Option 2: Solid Suspension**: This is incorrect because while solid suspensions contain solid particles in a liquid, they do not exhibit Brownian movement in the same way colloidal solutions do.
- **Option 3: True Solution**: This is also incorrect. True solutions have solute particles that are too small to exhibit Brownian movement.
- **Option 4: Unsaturated Fatty Acid**: This option is not relevant to Brownian movement as it refers to a type of fat and does not pertain to particle motion in a fluid.

5. **Conclusion**: Based on the analysis of the options, the correct answer is that Brownian movement is found in colloidal solutions.

**Final Answer**: Brownian movement is found in colloidal solutions.

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