Verified Solution • 2025–26 Session moderate

QPage 32: Q3: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 32: Q3 Solution: Do you expect the gas in a cooking gas cylinder to obey the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often apply $PV=nRT$ to gases in a cylinder without checking pressure and temperature, overlooking that near liquefaction the intermolecular forces and molecular volume are non‑negligible; always verify that the gas is far from its critical point or use a compressibility factor/real‑gas equation instead.

Do you expect the gas in a cooking gas cylinder to obey the ideal gas equation?

Step-by-Step Verified Solution

**Answer:** No, the gas in a cooking gas cylinder does not obey the ideal gas equation strictly because it is close to its liquefaction point and intermolecular forces are significant. **Step-by-Step Explanation:** The ideal gas equation PV=nRTPV = nRT assumes negligible intermolecular forces and negligible molecular volume. In a cooking gas cylinder, the gas is under high pressure and near its condensation temperature, so intermolecular attractions and finite molecular volume become important. Hence, it deviates significantly from ideal gas behaviour.

All Questions in this Chapter

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