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Q. Assertion : Monoclinic sulphur is an example of monoclinic crystal system.
Reason : For a monoclinic system, $a\ne b\ne c$ and $\alpha=\gamma=90^{\circ}, \beta=90^{\circ}$.

AIIMSAIIMS 2014The Solid State

Solution:

Crystals in a monoclinic system are referred to three axes of unequal length, with two axes being perpendicular to each other.