Chemistry Solids ETEA 2022
PMDC Verified Question 36 of 54
Which one of the following is the example of polar molecular solids?
A
Ice
B
Iodine
C
Copper
D
Phosphorous
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Ice
Concept:
Molecular solids are formed by molecules held together by intermolecular forces. If the molecules possess a permanent dipole moment, the solid is a polar molecular solid.

Solution:
  • Ice is the solid form of water (\( \text{H}_2\text{O} \)).
  • The water molecule has a bent geometry and highly polar O-H bonds, resulting in a strong permanent net dipole moment.
  • In ice, these polar molecules are held together by strong dipole-dipole interactions (specifically, hydrogen bonding), classifying it as a polar molecular solid.


Why other options are incorrect:
  • B, D: Iodine (\( \text{I}_2 \)) and Phosphorus (\( \text{P}_4 \)) consist of identical non-metal atoms, forming completely non-polar molecules.
  • C: Copper is a metal, forming a metallic solid, not a molecular one.

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