Assertion`:-`Internal energy of a real gas may change during expansion at const. temperature.
Reason`:-` Internal energy of a real gas ia function of `T` & `P`.

Options

A. If both the statements are TRUE and STATEMENT-2 is the correct explanation of STATEMENT-16
B. If both the statements are TRUE but STATEMENT-2 is NOT the correct explanation of STATEMENT-16
C. If STATEMENT-1 is TRUE and STATEMENT-2 is FALSE
D. If STATEMENT-1 is FALSE and STATEMENT-2 is TRUE

Answer

To solve the question regarding the assertion and reason about the internal energy of a real gas, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states that "the internal energy of a real gas may change during expansion at constant temperature."

- **Understanding Internal Energy:** Internal energy (U) is a thermodynamic property that reflects the total energy contained within a system, including kinetic and potential energies of the molecules.
- **Real Gas Behavior:** Unlike ideal gases, real gases exhibit interactions between molecules, which can affect their internal energy.
- **Expansion at Constant Temperature:** During an isothermal expansion (constant temperature), one might assume that internal energy remains constant. However, for real gases, the interactions between molecules can lead to changes in internal energy even when the temperature is held constant.

**Conclusion for Assertion:** The assertion is **true** because the internal energy of a real gas can change during expansion at constant temperature due to intermolecular forces.

### Step 2: Analyze the Reason
The reason states that "the internal energy of a real gas is a function of T and P."

- **Understanding the Dependence of Internal Energy:** For real gases, the internal energy is primarily a function of temperature (T) and volume (V), not pressure (P). The interactions between molecules (which are influenced by volume) play a significant role in determining the internal energy.
- **Correct Functionality:** The internal energy of a real gas is not directly a function of pressure; instead, it is more accurately described as a function of temperature and volume.

**Conclusion for Reason:** The reason is **false** because the internal energy of a real gas is a function of temperature and volume, not pressure.

### Final Conclusion
- The assertion is **true**.
- The reason is **false**.

### Summary
- **Assertion:** True
- **Reason:** False