Q9 / 150 · MHT CET 2025 (27 Apr Shift 2) · Chemistry

What is the total number of different types of unit cells in tetragonal crystal system?

  • Correct answer
    A
    1
  • B
    2
  • C
    3
  • D
    4

Solution

The tetragonal crystal system is defined by unit cell parameters where $a = b \neq c$ and $\alpha = \beta = \gamma = 90^{\circ}$.

Two Bravais lattice types exist in this system:

A primitive (P) tetragonal unit cell contains lattice points only at the corners.

A body-centered (I) tetragonal unit cell has points at the corners and one at the body center.

This gives a total of two distinct unit cells in the tetragonal system.

The correct answer is B.

Hence, the correct answer is option: 'A'.

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