Q3 / 90 · JEE Main 2021 (27 Jul Shift 1) · Chemistry

The parameters of the unit cell of a substance are $a = 2.5, b = 3.0, c = 4.0, α = 90 °, β = 120 ° γ = 90 ° .$ The crystal system of the substance is :

A
Hexagonal
B
Orthorhombic
Correct answer
C
Monoclinic
D
Triclinic

Solution

a \neq b \neq c

and

α = γ = 90 ° \neq β

are parameters of monoclinic unit cell.

Hence, the correct answer is option: 'C'.

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