Chemistry Gases ETEA 2016
PMDC Verified Question 60 of 65
At absolute zero the molecules of hydrogen gas will have:
A
Only translational motion
B
Only vibrational motion
C
Only rotational motion
D
All the motion are ceased
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All the motion are ceased
Concept:

Absolute zero (0 K or -273.15°C) is the theoretical lowest possible temperature. It represents a state of zero thermodynamic energy.

Solution:

  • Temperature is a direct measure of the average kinetic energy of gas molecules.


  • As temperature approaches absolute zero, the kinetic energy of the molecules approaches zero.


  • Consequently, according to classical kinetic theory, all forms of molecular motion (translational, rotational, and vibrational) theoretically cease completely.


Why other options are incorrect:

  • Options A, B, & C: If any motion existed, the molecules would possess kinetic energy, meaning the temperature would be above absolute zero.

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