Question

Which of the following unit cell has all the angles at 90˚ but the sides are of unequal length?

(a) Monoclinic unit cell

(b) Orthorhombic unit cell

(c) Triclinic unit cell

(d) Hex clinic unit cell

This question was posed to me by my college professor while I was bunking the class.

This is a very interesting question from Definitions in division X-Ray Diffraction of Solid State Chemistry

Answer 1

Correct answer is (b) Orthorhombic unit cell

Best explanation: The orthorhombic unit cell may be regarded as something like a shoebox in which the angles are all 90˚ but the sides are of unequal length. It usually possesses several mirror planes of symmetry and several twofold axes.