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

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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