Chemistry Solids DUHS 2024
PMDC Verified Question 12 of 54
Dry ice is the example of:
A
Molecular solid
B
Metallic solid
C
Covalent solid
D
Ionic solid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Molecular solid
Concept:
Dry ice is the common name for the solid form of Carbon Dioxide (\( \text{CO}_2 \)).

Solution:
  • In dry ice, the fundamental building blocks occupying the crystal lattice points are independent, discrete \( \text{CO}_2 \) molecules.
  • Because these molecules are completely non-polar, they are held in place exclusively by weak Van der Waals forces (London dispersion forces).
  • Any solid constructed of discrete molecules held by intermolecular forces is classified as a molecular solid.


Why other options are incorrect:
  • C: It is not a covalent solid because there is no continuous, infinite network of covalent bonds between the molecules, only weak dispersion forces.
  • B, D: It contains no ions or free electrons.

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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