Question

Identify the correct variation of pressure and volume of a real gas (A) and an ideal gas (B) at constant temperature.
($ y = P, x = V $)

• A.
• B.
• C.
• D.

Hint:

Ideal gas: \( PV = nRT \) (hyperbola). Real gas deviates due to attractions and repulsions; curve lies above ideal at high P.

Answer 1

The Correct Option is C

For an ideal gas: \[ PV = nRT \Rightarrow P \propto \frac{1}{V} \Rightarrow \text{A perfect hyperbolic curve} \] Real gases deviate from ideal behavior due to:
- Intermolecular forces
- Finite volume of molecules
Hence:
- Real gas pressure is higher than ideal gas at the same volume, especially at high pressure or low temperature.
Thus, real gas curve lies above the ideal gas curve on a \( P \) vs. \( V \) graph.