Which of the following statements is correct?

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(B) Option $(B)$ is correct. $A$ crystal system is classified as hexagonal if its unit cell parameters are $a = b 
e c$ and the axial angles are $\al

Vedclass · Accepted Answer

The unit cell having crystal parameters $a = b 
e c, \alpha = \beta = 90^{\circ}, \gamma = 120^{\circ}$ is hexagonal.

Vedclass · Answer

(B) Option $(B)$ is correct. $A$ crystal system is classified as hexagonal if its unit cell parameters are $a = b 
e c$ and the axial angles are $\alpha = \beta = 90^{\circ}, \gamma = 120^{\circ}$.Option $(A)$ is incorrect because $AgBr$ exhibits both Schottky and Frenkel defects.Option $(C)$ is incorrect because Frenkel defect occurs in ionic compounds where the ratio $\frac{r_+}{r_-}$ is low (due to a large difference in size between the cation and anion).Option $(D)$ is incorrect because the coordination number of $Na^{+}$ in $NaCl$ is $6$,not $4$.

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