Question

The CORRECT statement in the following is, ....... 

(A) the ionic crystal of AgBr has Schottky defect 

(B) the unit cell having crystal parameters, a = b \(\neq\) c, \(\alpha\) = \(\beta\) = 90\(^\circ\) and \(\gamma\) = 120\(^\circ\) is hexagonal 

(C) in ionic compounds having Frenkel defect, the ratio \(\cfrac{\gamma_+}{\gamma_-}\) is high 

(D) the coordination number of Na⁺ ion in NaCl is 4

Answer 1

Correct answer is: (B) the unit cell having crystal parameters, a = b \(\neq\) c, \(\alpha\) = \(\beta\) = 90\(^\circ\) and \(\gamma\) = 120\(^\circ\) is hexagonal