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 \[{{r}_{+}}/{{r}_{-}}\] is high
D) The coordination number of \[N{{a}^{+}}\] ion in \[NaCl\]is 4
Correct Answer: B
Solution :
For hexagonal unit cell, the crystal parameters are \[a=b\ne c,\text{ }\alpha =\beta ={{90}^{o}},\]\[\gamma ={{120}^{o}}\] While coordination number of \[N{{a}^{+}}\] ion in \[NaCl\] is 6. \[AgBr\]mainly exhibit Frenkel defect and Frenkel defect does not affect the \[{{r}_{+}}/{{r}_{-}}\] ratio.
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