Chemistry Solids SZABMU 2022
PMDC Verified Question 34 of 54
The molecules of iodine (\( \text{I}_2 \)) form the:
A
Molecular crystals
B
Covalent crystals
C
Ionic crystals
D
Metalic crystals
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 crystals
Concept:
The nature of a crystal depends on the constituent particles and the forces holding them together.

Solution:
  • Iodine exists as stable, discrete non-polar diatomic molecules (\( \text{I}_2 \)).
  • In the solid state, these independent \( \text{I}_2 \) molecules occupy the lattice points.
  • They are held together by weak intermolecular forces (specifically London dispersion forces).
  • Therefore, solid iodine forms molecular crystals.


Why other options are incorrect:
  • B: Covalent crystals feature a giant continuous network of atoms, not discrete molecules.
  • C, D: Iodine does not contain ions or free electrons.

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