Q.

Which of the following compounds shows both Schottky and Frenkel defect

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a

AgCl

b

NaCl

c

AgBr

d

CsCl

answer is C.

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Detailed Solution

Both Frankel and Schottky defect shown by AgBr.
AgBr has ccp lattice, where atoms of Br occupies all octahedral sites along with the atoms of Ag. Ag moves from octahedral to tetrahedral sites thereby causing only cations to precipitate. This indicates that Frankel defect shown by AgBr.
Also, AgBr shows schottky defect because of the precipitation of both cations and anions. In AgBr, Ag ion is small, therefore when removed from lattice point they can occupy interstitial sites.

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Which of the following compounds shows both Schottky and Frenkel defect