Chemistry Gases DUHS 2022
PMDC Verified Question 41 of 65
Gases deviate from ideal behavior more:
A
Gases do not deviate from ideal behavior
B
Both temperature & pressure low
C
Both temperature & pressure high
D
At high pressure & low temperature
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: At high pressure & low temperature
Concept:

Ideal gases are assumed to have zero intermolecular forces and negligible volume. Real gases deviate from this assumption when they are forced closely together or moving slow enough for attractive forces to take over.

Solution:

  • High Pressure: Under high pressure, gas molecules are squeezed closely together. The empty space decreases, making the actual physical volume of the molecules significant (violating the negligible volume assumption).


  • Low Temperature: At low temperatures, the kinetic energy of the molecules drops. They move sluggishly, allowing the weak intermolecular forces of attraction to effectively pull them together (violating the no-attraction assumption).


  • Therefore, gases show maximum deviation from ideal behavior at high pressure and low temperature.


Why other options are incorrect:

  • Option A: All real gases deviate from ideal behavior under certain conditions.
  • Option E: Low pressure and high temperature are actually the ideal conditions where real gases behave most ideally.
  • Options B & C: These combinations provide conflicting effects on ideality.

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.

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