1.

Pick up the correct statement:(a) The crystal of AgBr does not have Schottky defect (b) The crystal system having crystal parameters, a = b != c, alpha= beta= 90^(@), gamma= 120^(@)is for a hexagonal unit cell (c) Ionic compounds having Frenkel defect,generally show a low radius ratio value. (d) The coordination number of Na^(+) ion in NaCl is 4

Answer»

(a), (B)
(b), (C)
(c), (d)
(a), (c)

ANSWER :B


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