Chemistry Gases SET 2019
PMDC Verified Question 55 of 65
Which of the statement is applicable for both ideal and real gases molecules?
A
Have no forces of attraction
B
Collisions between the molecules is elastic
C
Molecules are in random movement
D
The actual volume of gas is negligible as compared to the volume of gas
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Molecules are in random movement
Concept:

While real gases deviate from ideal gases in terms of volume and intermolecular forces, they still share fundamental kinetic behaviors regarding motion.

Solution:

  • A core postulate of the Kinetic Molecular Theory that holds true for absolutely all gases (real or ideal) is that their molecules are in constant, continuous, and highly random motion.


  • They travel in straight lines until they collide with each other or the walls of the container.


Why other options are incorrect:

  • Option A: Real gases do have intermolecular forces of attraction (van der Waals forces).
  • Option B: Collisions in real gases are not perfectly elastic; some energy can be lost or transferred into internal molecular modes.
  • Option D: Real gases have a definite, non-negligible molecular volume, especially at high pressures.

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