Chemistry Solids DUHS 2022
PMDC Verified Question 38 of 54
Small diffusion in solid is due to:
A
Very fast motion of its particles
B
Vibrational motion of its particles
C
Translational motion of its particles
D
Diffusion into solid is not present
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Diffusion into solid is not present
Concept:
Diffusion is the net movement of particles from an area of higher concentration to lower concentration, relying heavily on the ability of particles to move freely through space (translational motion).

Solution:
  • In ideal crystalline solids, particles (atoms, ions, or molecules) are tightly packed and locked into fixed lattice positions.
  • They can only vibrate around these fixed mean positions; they lack the free translational motion required for macroscopic diffusion.
  • Because of this absolute lack of translational mobility, practical, large-scale diffusion into solids is considered not present (or incredibly negligible compared to liquids and gases).


Why other options are incorrect:
  • A, C: Particles in a solid do not have fast motion or translational motion.
  • B: While solids do have vibrational motion, vibration alone at fixed lattice points does not facilitate diffusion.

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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