Chemistry Gases NUMS 2023
PMDC Verified Question 29 of 65
The idea that molecules in gases are in constant movement is called:
A
Kinetic theory of gases
B
Crystal field theory
C
Molecular orbital theory
D
Transition state theory
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Kinetic theory of gases
Concept:

Different theories in chemistry address different states of matter and different types of molecular interactions.

Solution:

  • The core principle that gas molecules are in constant, random, and rapid motion is the primary postulate of the Kinetic theory of gases (or Kinetic Molecular Theory).


  • This theory uses this "constant movement" to explain macroscopic properties like gas pressure (arising from collisions with the container) and diffusion.


Why other options are incorrect:

  • Option B: Crystal field theory describes the breaking of orbital degeneracies in transition metal complexes (coordination chemistry).
  • Option C: Molecular orbital theory explains chemical bonding by combining atomic orbitals to form molecular orbitals.
  • Option D: Transition state theory explains the reaction rates of chemical kinetics by observing the activated complex.

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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