Chemistry Solids PMC 2021
PMDC Verified Question 43 of 54
Shape of iodine unit cell.
A
Orthorhombic
B
Hexagonal
C
Triclinic
D
Face-centered cubic
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Face-centered cubic
Concept:
Molecular crystals like solid Iodine (\( \text{I}_2 \)) pack in specific geometric unit cells.

Solution:
  • According to the provided source text and explanatory notes, the structural geometry of the solid iodine unit cell is defined as face-centered cubic (FCC).
  • (Note: While advanced crystallographic data often defines iodine as base-centered orthorhombic, within the scope of this specific historical curriculum and textbook key, it is evaluated as face-centered cubic.)


Why other options are incorrect:
  • A, B, C: Based on the strict parameters of the provided answer key, these shapes do not define the iodine unit cell.

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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