Solid State Question 294
Question: The correct statement in the following is
[MP PET 1997]
Options:
A) The ionic crystal of $ AgBr $ has Schottky defect
B) The unit cell having crystal parameters, $ a=b\ne c, $ $ \alpha =\beta =90^{o},\gamma =120^{o} $ is hexagonal
C) In ionic compounds having Frenkel defect the ratio $ \frac{{\gamma _{+}}}{{\gamma _{-}}} $ is high
D) The coordination number of $ N{{a}^{+}} $ ion in $ NaCl $ is 4
Show Answer
Answer:
Correct Answer: B
Solution:
A crystal system is hexagonal if its unit cell having $ a=b\ne c $ axial ratio and $ \alpha =\beta =90{}^\circ , $
$ \gamma =120{}^\circ $ axial angles.
BETA
