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Home Questions B9A8XFRC9H
Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Solid State

Question:
Edge length: a = b ≠ c Angles: α = β = 90°  γ = 120°

Which of the following crystal systems is represented by the above-mentioned conditions of various parameters of a unit cell?

Options:

Cubic

Hexagonal

Monoclinic

Triclinic

Correct Answer:

Hexagonal

Explanation:

The correct answer is option 2. Hexagonal.

Crystal system Edge lengths  Angles
Cubic a = b = c α = β = γ = 90°
Tetragonal a = b ≠ c α = β = γ = 90°
Orthorhombic a ≠ b ≠ c α = β = γ = 90°
Monoclinic a ≠ b ≠ c α = γ = 90° β ≠ 90°
Hexagonal a = b ≠ c α = β = 90°  γ = 120°
Rhombohedral a = b = c α = β = γ ≠ 90°
Triclinic a ≠ b ≠ c  α ≠ β ≠ γ ≠ 90°

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