Which of the following statements given about emulsions is incorrect ?

Options

A. The droplets in emulsions are often negatively charged and can be precipitated by electrolytes .
B. Emulsion can be diluted with any amount of the dispersed liquid. On the other hand, the dispersion medium when mixed, forms a separate layer.
C. Emulsions can be broken into constituent liquids by heating , freezing , centrifuging ,etc.
D. Emulsions also show Browian movement and Tyndall effect.

Explanation

To determine which statement about emulsions is incorrect, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Emulsions**:
- An emulsion is a mixture of two immiscible liquids where one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Common examples include oil in water (O/W) and water in oil (W/O) emulsions.

2. **Analyzing Option A**:
- **Statement**: "Droplets in emulsion are often negatively charged and can be precipitated by electrolyte."
- **Evaluation**: This statement is correct. In many emulsions, the dispersed droplets carry a negative charge, and the addition of electrolytes can lead to coagulation or precipitation of these droplets.

3. **Analyzing Option B**:
- **Statement**: "Emulsions can be diluted with any amount of disperse liquid; on the other hand, the dispersion medium when mixed forms a separate layer."
- **Evaluation**: This statement is incorrect. While emulsions can be diluted by adding more of the dispersion medium (e.g., adding water to an oil-in-water emulsion), adding more of the dispersed phase (e.g., more oil) would lead to separation, forming a distinct layer. Therefore, this statement misrepresents the behavior of emulsions.

4. **Analyzing Option C**:
- **Statement**: "Emulsions can be broken into constituent liquids by heating, freezing, and centrifugation."
- **Evaluation**: This statement is correct. Emulsions can indeed be separated into their constituent liquids using methods like heating, freezing, or centrifugation.

5. **Analyzing Option D**:
- **Statement**: "Emulsions also show Brownian movement and Tyndall effect."
- **Evaluation**: This statement is correct. Emulsions exhibit Brownian motion due to the movement of dispersed particles and can show the Tyndall effect, which is the scattering of light by the dispersed phase.

### Conclusion:
After evaluating all the options, we find that **Option B** is the incorrect statement regarding emulsions.