Solid State - Result Question 9

####9. Which primitive unit cell has unequal edge lengths (abc) and all axial angles different from 90 ?

(a) Hexagonal

(b) Monoclinic

(c) Tetragonal

(d) Triclinic

(2019 Main, 10 Jan I)

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Answer:

Correct Answer: 9. (d)

Solution:

  1. Triclinic primitive unit cell has dimensions as, abc and αβγ90.

Among the seven basic or primitive crystalline systems, the triclinic system is most unsymmetrical. In other cases, edge length and axial angles are given as follows :

Hexagonal : a=bc and α=β=90,γ=120

Monoclinic : abc and α=γ=90,β90

Tetragonal : abc and α=β=γ=90



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