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Question

Which of the following points defects are shown by $$AgBr_{(s)}$$ crystals?
(I) Schottky defect 
(II) Frenkel defect 
(III) Metal defect
(IV) Metal deficiency defect


A
(I) and (II)
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B
(III) and (IV)
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C
(I) and (III)
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D
(II) and (IV)
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Solution

The correct option is A (I) and (II)
$$AgBr$$ shows both Schottky and Frenkel defects. In $$AgBr$$, both $$Ag^+$$ and $$Br^-$$ ions are absent from the lattice causing a Schottky defect. However, $$Ag^+$$ ions are mobile so they have a tendency to move aside the lattice and trapped in the interstitial site, hence cause Frenkel defect.

Hence, Option "A" is the correct answer.

Chemistry

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