Solid State - Result Question 9
####9. Which primitive unit cell has unequal edge lengths
(a) Hexagonal
(b) Monoclinic
(c) Tetragonal
(d) Triclinic
(2019 Main, 10 Jan I)
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Answer:
Correct Answer: 9. (d)
Solution:
- Triclinic primitive unit cell has dimensions as,
and .
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 :
Monoclinic :
Tetragonal :