1. Tardigrade
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  3. Chemistry
  4. The unit cell with crystallographic dimensions, a ≠ b ≠ c, α = γ = 90 and β ≠ 90 is

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Q. The unit cell with crystallographic dimensions, $a \neq b \neq c, \alpha = \gamma$ = $90$ and $\beta \neq\,90$ is

KCETKCET 2015The Solid State

Solution:

The correct option is (b) Monoclinic

In triclinic, unit cell, dimensions are

$a \,\neq b \neq \,c, \alpha \neq \beta \neq \gamma \neq 90^{\circ}$

In orthorhombic, unit cell dimensions are

$a \neq b \neq c, \alpha=\beta=\gamma=90^{\circ}$

and in tetragonal, unit cell dimensions

$a=b \neq c, \alpha=\beta=\gamma=90^{\circ}$