Select incorrect statement (s)

Options

A. At very low pressure real gases show minimum deviation from ideal behaviour.
B. The compressibility factor for an ideal gas is zero.
C. At Boyle temperature real gas behave as ideal gas in high pressure region.
D. Real gas show maximum deviation at high pressure and low temperature.

Explanation

To solve the question of selecting the incorrect statements regarding the behavior of real gases compared to ideal gases, we will analyze each statement based on the principles of gas behavior.

### Step-by-Step Solution:

1. **Understanding Ideal and Real Gases**:
- Ideal gases follow the ideal gas law (PV = nRT) without any deviations.
- Real gases deviate from this behavior due to intermolecular forces and the volume occupied by gas molecules.

2. **Statement Analysis**:
- **Statement A**: "At very low pressure, real gases show minimum deviation from the ideal gas behavior."
- At very low pressure, the volume of the gas is high, and the intermolecular forces become negligible. Thus, real gases do behave more like ideal gases, but the statement claims "minimum deviation," which can be misleading as deviations can still occur.
- **Conclusion**: This statement is **incorrect**.

- **Statement B**: "Compressibility factor for ideal gas is not 0, this is 1."
- The compressibility factor (Z) is defined as Z = PV/nRT. For an ideal gas, Z = 1. Therefore, this statement is **correct**.

- **Statement C**: "At Boyle's temperature, real gas behaves as an ideal gas in high pressure region."
- Boyle's temperature is the temperature at which a real gas behaves ideally at all pressures. This statement is misleading because it suggests that real gases behave ideally only at high pressures, which is not true. They behave ideally at Boyle's temperature regardless of pressure.
- **Conclusion**: This statement is **incorrect**.

- **Statement D**: "Real gases show maximum deviation at high pressure and low temperature."
- This statement is true because at high pressures, the volume of the gas is reduced, and intermolecular forces become significant. At low temperatures, the kinetic energy of the molecules decreases, enhancing the effect of these forces.
- **Conclusion**: This statement is **correct**.

3. **Final Selection of Incorrect Statements**:
- The incorrect statements are **A** and **C**.

### Summary of Incorrect Statements:
- **A**: At very low pressure, real gases show minimum deviation from the ideal gas behavior. (Incorrect)
- **C**: At Boyle's temperature, real gas behaves as an ideal gas in high pressure region. (Incorrect)