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
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.
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