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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