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The unit cell with a≠b≠c and α=γ=90, β≠90 refers to __________crystal system.

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The unit cell with a≠b≠c and α=γ=90, β≠90 refers to __________crystal system.

(a) cubic

(b) tetragonal

(c) monoclinic

(d) triclinic

The question was asked by my school principal while I was bunking the class.

This key question is from Amorphous and Crystalline Solids in division Solid State of Chemistry – Class 12

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The correct option is (c) monoclinic

To elaborate: In monoclinic crystal system, all the three axes are unequal in length and two axes are perpendicular to each other. Gypsum and borax are examples of monoclinic crystals.

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