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Question:

In a monoclinic unit cell, the relation of sides and angles are, respectively:

a=b≠c and α=β=γ=90°

a≠b≠c and α=β=γ=90°

a≠b≠c and β=γ=90°≠α

a≠b≠c and α≠β≠γ≠90°

Solution:

Monoclinic crystal is one of the 7 crystal systems. In the monoclinic system, the crystal is described by vectors of unequal lengths, so we have a≠b≠c and β=γ=90°≠α. Option C is correct.