1.

Which of the following point defects are shown by AgBr(s) crystals ? (i) Schottky defect (ii) Frenkel defect (iii) Metal excess defect (iv) Metal deficiency defect

Answer»

(i) and (ii) 
(iii) and (iv) 
(i) and (iii) 
(ii) and (iv) 

Solution :AgBr shows Schottky and FRENKEL DEFECTS. In AgBr, both `Ag^+` and Br are absent from lattice sites. ALSO `Ag^+` ions have tendency to MOVE aside the lattice and trapped in interstitial sites.


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