Chemistry Gases UHS 2024
PMDC Verified Question 1 of 65
Intermolecular forces between molecules of ideal gas are:
A
Strong
B
Moderate
C
Weak
D
Absent
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Absent
Concept:

The Kinetic Molecular Theory sets specific boundary conditions to define what makes a gas behave "ideally" according to \( PV=nRT \).

Solution:

  • An ideal gas is a hypothetical construct. To make the math of the ideal gas law perfectly linear, scientists assume that gas particles act completely independently.


  • Therefore, a core postulate states that there are no attractive or repulsive forces—van der Waals, dipole, or otherwise—between the molecules.


  • In an ideal state, these forces are totally absent.


Why other options are incorrect:

  • Options A, B, & C: If any level of force (even weak) exists, the gas will deviate from ideal laws (it becomes a "real gas"), especially at high pressures or low temperatures where these forces cause the gas to condense.

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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