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Which of the following point defects are shown by AgBr(s) crystals?
(A) Schottky defect
(B) Frenkel defect
(C) Metal excess defect
(D) Metal deficiency defect
(i) (A) and (B)
(ii) (C) and (D)
(iii) (A) and (C)
(iv) (B) and (D)
Answers (1)
The answer is the option (i).
Silver bromide shows Schottky as well as Frenkel defects. In AgBr, both the silver cation and bromide ion are absent from the lattice causing Schottky defect. But the silver ions are smaller in size and mobile, so they have a tendency to occupy interstitial sites when removed from lattice point. Hence cause Frenkel defect. ‘
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