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Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Solid State

Question:

How many crystal systems exists in which constituent particles can be arranged?

Options:

5

6

7

8

Correct Answer:

7

Explanation:

The correct answer is option 3. 7.

There are 7 crystal systems in which constituent particles can be arranged. Crystalline solids can be classified into different crystal systems based on their unit cell parameters, such as edge lengths and angles between edges. The seven crystal systems are:

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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