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Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Solid State

Question:

Which of the following is correct for a hexagonal crystal system?

Options:

a = b ≠ c, α = β = γ = 90°

a ≠ b ≠ c, α = β = γ = 90°

a = b ≠ c, α = β = 90° γ = 120°

a ≠ b ≠ c, α = γ = 90° β ≠ 90°

Correct Answer:

a = b ≠ c, α = β = 90° γ = 120°

Explanation:
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°

CUET Questions