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AIIMS 2004
Exam
AIIMS
Year
2004
Subject
Chemistry
Chapter
Solid State

AIIMS 2004 · Chemistry · Solid State

The crystal system of a compound with unit cell dimensions a=0.387...

The crystal system of a compound with unit cell dimensions a=0.387 nm,b=0.387 nma=0.387 \mathrm{~nm}, b=0.387 \mathrm{~nm} and c=0.504 nmc=0.504 \mathrm{~nm} and α=β=90∘\alpha=\beta=90^{\circ} and γ=120∘\gamma=120^{\circ} is

Options

  1. Acubic
  2. Bhexagonal
  3. Corthorhombic
  4. Drhombohedral.

Correct answer

B. hexagonal

Step-by-step solution

When a=b≠c,α=β=90∘,γ=120∘a=b \neq c, \alpha=\beta=90^{\circ}, \gamma=120^{\circ}. The given condition is characteristic of hexagonal system.
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