Chemistry Gases PMC 2021
PMDC Verified Question 48 of 65
PV/nRT for an ideal gas is called:
A
Expansion factor
B
Depression factor
C
Compressibility factor
D
Diffusion factor
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Compressibility factor
Concept:

The ratio of the molar volume of a real gas to the molar volume of an ideal gas at the same temperature and pressure is a measure of deviation from ideality.

Formula:

$$ Z = \frac{PV}{nRT} $$

Solution:

  • The mathematical expression \( \frac{PV}{nRT} \) is defined as the compressibility factor, denoted by the symbol \( Z \).


  • For a perfectly ideal gas, \( PV = nRT \), which means \( Z = 1 \) under all conditions of temperature and pressure.


  • For real gases, \( Z \) deviates from 1 (can be >1 or <1) indicating non-ideal behavior due to intermolecular forces or molecular volume.


Why other options are incorrect:

  • Options A, B, & D: These are incorrect terms that do not describe the thermodynamic ratio \( \frac{PV}{nRT} \).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

Previous Question All Gases MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App