Q.

Which of the following point defects are shown by AgBr (s) crystals?I. Schottky defectII. Frenkel defectIII. Metal excess defectIV. Metal deficiency defect

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a

I and II

b

III and IV

c

I and III

d

II and IV

answer is A.

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Detailed Solution

AgBr shows both Schottky as well as Frenkel defect. In AgBr both Ag+ and Br- ions are absent from the lattice causing Schottky defect.However, Ag+ ions are mobile, so they have a tendency to move aside the lattice and trapped in interstitial site, hence cause Frenkel detect.
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