Which of the following is not correct?

Options

A. Solids have fixed shape and fixed volume.
B. We can easily compress a liquid but not a gas.
C. Solids have negligible kinetic energy of the particles.
D. Property of diffusion is maximum in the gaseous state.

Explanation

To solve the question "Which of the following is not correct?", we need to analyze each of the given statements one by one.

### Step-by-Step Solution:

1. **Analyze Option A**: "Solids have fixed shape and fixed volume."
- Solids do indeed have a definite shape and volume. For example, a pen maintains its shape and volume regardless of the conditions.
- **Conclusion**: This statement is correct.

**Hint**: Remember that solids maintain their shape and volume due to the strong intermolecular forces.

2. **Analyze Option B**: "We can easily compress a liquid but not a gas."
- This statement is incorrect. Gases are highly compressible due to the large spaces between particles, while liquids have a much lower compressibility.
- **Conclusion**: This statement is not correct.

**Hint**: Think about the arrangement of particles in liquids versus gases; gases have more space to move.

3. **Analyze Option C**: "Solids have negligible kinetic energy of the particles."
- In solids, particles are closely packed and can only vibrate in place, which means they have low kinetic energy compared to liquids and gases.
- **Conclusion**: This statement is correct.

**Hint**: Consider how particle movement differs in solids, liquids, and gases.

4. **Analyze Option D**: "The property of diffusion is maximum in the gaseous state."
- Diffusion occurs more rapidly in gases than in liquids and solids due to the greater distance between gas particles.
- **Conclusion**: This statement is correct.

**Hint**: Recall that diffusion involves the movement of particles from an area of higher concentration to lower concentration.

### Final Conclusion:
Based on the analysis, the statement that is not correct is **Option B**: "We can easily compress a liquid but not a gas."

### Summary:
- **Correct Statements**: A, C, D
- **Incorrect Statement**: B

### Final Answer:
**Option B is not correct.**