Which premitive unit cell has unequal edge lenghs

Question:

Which premitive unit cell has unequal edge lenghs $(a \neq b \neq c)$ and all axial angles differetn from $90^{\circ}$ ?

  1. Tetragonal

  2. Hexagonal

  3. Monoclinic

  4. Triclinic


Correct Option: , 4

Solution:

In Triclinic unit cell

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

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