Which property is observed in an emulsion?

Options

A. Tyndall effect
B. Brownian motion
C. Both (1) & (2)
D. None of these

Answer

To determine which properties are observed in an emulsion, we will analyze the definitions and characteristics of emulsions, Tyndall effect, and Brownian motion.

### Step-by-Step Solution:

1. **Define Emulsion**:
An emulsion is a type of colloid that consists of two or more immiscible liquids. In an emulsion, one liquid is dispersed in the other, creating a non-homogeneous mixture. Common examples include milk (fat droplets in water) and vinaigrette (oil in vinegar).

**Hint**: Remember that emulsions involve two liquids that do not mix well together.

2. **Understanding Tyndall Effect**:
The Tyndall effect is the scattering of light by colloidal particles. When a beam of light passes through a colloidal solution, the particles scatter the light, making the path of the beam visible. This effect is commonly observed in emulsions due to the presence of dispersed particles.

**Hint**: Think about how light behaves when it hits tiny particles suspended in a liquid.

3. **Understanding Brownian Motion**:
Brownian motion refers to the random, ceaseless movement of particles suspended in a fluid. This motion occurs due to collisions between the particles and the molecules of the fluid. In emulsions, the dispersed phase particles exhibit Brownian motion, which helps to keep them suspended.

**Hint**: Consider how particles move randomly in a fluid and how this affects their stability in an emulsion.

4. **Conclusion**:
Both the Tyndall effect and Brownian motion are properties observed in emulsions. The Tyndall effect demonstrates the scattering of light by the dispersed phase, while Brownian motion indicates the random movement of these particles.

**Final Answer**: The correct option is C: both 1 and 2.