Select the incorrect statement.

Options

A. Latent heat of fusion is used to overcome the forces of attraction between molecules in solid state.
B. During the phase change, from liquid to solid and from gas to liquid, the temperature increases.
C. Neon sign bulb is an example of plasma.
D. If a few spoons of common salt are dissolved in pure water then its freezing point becomes less than `0^(@)C`.

Answer

To solve the question "Select the incorrect statement," we will analyze each statement provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding Latent Heat of Fusion**:
- The first statement claims that "latent heat of fusion is used to overcome the forces of attraction between the molecules in the solid state."
- Latent heat of fusion refers to the energy required to convert a solid into a liquid at its melting point without changing its temperature.
- This energy indeed helps to overcome the intermolecular forces that hold the solid together, allowing the molecules to move freely in the liquid state.
- **Conclusion**: This statement is **correct**.

2. **Phase Change and Temperature**:
- The second statement states that "during the phase change from liquid to solid and from gas to liquid, the temperature increases."
- During phase changes, such as freezing (liquid to solid) and condensation (gas to liquid), the temperature remains constant until the phase change is complete.
- Energy is either absorbed or released during these processes, but the temperature does not increase.
- **Conclusion**: This statement is **incorrect**.

3. **Neon Sign Bulb as Plasma**:
- The third statement mentions that "neon sign bulb is an example of plasma."
- Neon signs contain gas that becomes ionized when electricity is applied, creating plasma.
- Plasma is often referred to as the fourth state of matter, and neon signs are indeed an example of this.
- **Conclusion**: This statement is **correct**.

4. **Freezing Point Depression**:
- The fourth statement claims that "if we dissolve a few spoons of common salt in pure water, then its freezing point will be less than 0 degrees Celsius."
- When a solute like salt is added to water, it lowers the freezing point of the solution, a phenomenon known as freezing point depression.
- Thus, the freezing point of the saltwater solution is indeed lower than that of pure water.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The incorrect statement is **Statement 2**: "During the phase change from liquid to solid and from gas to liquid, the temperature increases."

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