Which of the following statements are incorrect?

Options

A. Molar volume of every gas at STP is 22.4 L
B. Under critical states compressibility factor is 1
C. All gases will have equal value of average KE at a given temperature
D. At absolute zero, KE is `3//2` R

Explanation

To determine which statements are incorrect, we will analyze each statement one by one.

### Step 1: Analyze Statement 1
**Statement 1:** "Molar volume of every gas at standard temperature pressure is 22.4 liters."

- **Explanation:** The molar volume of an ideal gas at standard temperature and pressure (STP) is indeed 22.4 liters. This is a well-established fact in chemistry. Therefore, this statement is **correct**.

### Step 2: Analyze Statement 2
**Statement 2:** "Under critical state, compressibility factor is 1."

- **Explanation:** The compressibility factor (Z) is defined as Z = PV/RT. At the critical point for a van der Waals gas, the compressibility factor is not equal to 1; instead, it is equal to 3/8. Therefore, this statement is **incorrect**.

### Step 3: Analyze Statement 3
**Statement 3:** "All gases will have equal value of average kinetic energy at a given temperature."

- **Explanation:** The average kinetic energy of gas molecules is directly proportional to the temperature of the gas. At a given temperature, all ideal gases will have the same average kinetic energy. Therefore, this statement is **correct**.

### Step 4: Analyze Statement 4
**Statement 4:** "At absolute zero, kinetic energy is 3/2."

- **Explanation:** At absolute zero (0 Kelvin), the kinetic energy of gas molecules is theoretically zero. The statement that kinetic energy is 3/2 at absolute zero is incorrect. Therefore, this statement is **incorrect**.

### Conclusion:
The incorrect statements are **Statement 2** and **Statement 4**.

### Summary of Incorrect Statements:
- **Statement 2:** Incorrect (Compressibility factor under critical state is 3/8, not 1).
- **Statement 4:** Incorrect (At absolute zero, kinetic energy is 0, not 3/2).