Chemistry Gases SZABMU 2023
PMDC Verified Question 20 of 65
Intermolecular forces between molecules of ideal gas are:
A
Very strong
B
Very weak
C
Zero
D
Moderately strong
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Zero
Concept:

The theoretical construct of an "ideal gas" relies heavily on a specific set of simplifying assumptions known as the postulates of the Kinetic Molecular Theory (KMT).

Solution:

  • One of the most foundational postulates of the KMT is that there are absolutely no forces of attraction or repulsion between ideal gas molecules.


  • This assumes that the molecules act as completely independent entities that only interact during instantaneous, perfectly elastic collisions.


  • Because an ideal gas is a mathematical model, these forces are defined as strictly zero.


Why other options are incorrect:

  • Options A, B, & D: Any presence of intermolecular forces (even "very weak" ones) defines a real gas, as these forces cause deviations from ideal \( PV=nRT \) behavior (requiring the van der Waals correction factor 'a').

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