Question

The correct statement in the following is

[MP PET 1997]

• A. The ionic crystal of AgBr has Schottky defect
• B. The unit cell having crystal parameters, a=b≠c, α=β=90°, γ=120°
• C. In ionic compounds having Frenkel defect the ratiois high
• D. The coordination number of Na⁺ ion in NaCl is 4

Answer 1

The correct option is B

The unit cell having crystal parameters, a=b≠c, α=β=90°, γ=120°

A crystal system is hexagonal if its unit cell having a=b≠caxial ratio and α=β=90°, γ=120° axial angles