Chemistry · States of Matter - Gases, Liquids and Solids
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The unit cell parameters of the monoclinic system are:
- A
a=b≠c ; α=β=γ=90
- B
a≠b≠c ; α=γ=90 ; β≠90
- C
a≠b=c ; α=β=90; γ≠90
- D
a=b=c ; α=β=γ=90
The monoclinic crystal system is characterized by three unequal axes, with two of them being perpendicular (α=γ=90°) and the third angle (β) differing from 90°. This distinguishes the monoclinic system from others where either all axes are equal or all angles are right angles. Option B correctly represents this with a≠b≠c ; α=γ=90° ; β≠90°. Options A, C, and D describe tetragonal, orthorhombic, and cubic systems, respectively, which do not fit the monoclinic parameters.
This describes a tetragonal system where two axes are equal, and all angles are right angles.
This correctly describes the monoclinic system, where all axes are unequal, and only two angles are right angles.
This represents an orthorhombic system, not hexagonal, where all angles are right angles but sides are unequal.
This describes a cubic system where all sides and angles are equal.
Tagged under Chemistry · States of Matter - Gases, Liquids and Solids · 2019