Question

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 : 

(1) Hexagonal 

(2) Orthorhombic 

(3) Monoclinic 

(4) Triclinic

Answer 1

Answer is (3) Monoclinic

a ≠ b ≠ c and α = γ = 90º ≠ β

are parameters of monoclinic unit cell.