Which of the following is NOT a postulate of the kinetic molecular theory of gases?

Options

A. The gas molecules possess a volume that is negligibly small compared to the container
B. The pressure and volume of a gas are inversely related
C. Gases consist of discrete particles that are in constant chaotic motion
D. The average kinetic energy of the molecules is directly proportional to the absoute temperature

Explanation

To determine which of the given options is NOT a postulate of the kinetic molecular theory (KMT) of gases, we can analyze each statement based on the fundamental principles of KMT.

### Step-by-Step Solution:

1. **Understanding Kinetic Molecular Theory (KMT)**:
- KMT explains the behavior of gases in terms of particles in motion. It has several key postulates that describe the properties of gases.

2. **Analyzing the Statements**:
- **Statement 1**: "Gas molecules possess a volume that is negligibly small compared to the container."
- This is a postulate of KMT, as it assumes that gas particles are point-like and do not occupy significant volume compared to the volume of the container.

- **Statement 2**: "The pressure and volume of gas are inversely related."
- This statement refers to Boyle's Law (PV = nRT at constant temperature), which describes the relationship between pressure and volume but is not a postulate of KMT itself. KMT does not directly state this relationship; it explains it through the motion of particles.

- **Statement 3**: "Gas consists of discrete particles that are in constant chaotic motion."
- This is a fundamental postulate of KMT, emphasizing that gas particles are in constant motion and collide with each other and the walls of the container.

- **Statement 4**: "Average kinetic energy is directly proportional to the absolute temperature."
- This is also a postulate of KMT, which states that the average kinetic energy of gas particles increases with an increase in temperature.

3. **Conclusion**:
- The statement that is NOT a postulate of KMT is **Statement 2**: "The pressure and volume of gas are inversely related."

### Final Answer:
The statement that is NOT a postulate of the kinetic molecular theory of gases is: **The pressure and volume of gas are inversely related.**