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Question

The correct statement(s) regarding defects in solids is / are


A

Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion

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B

Frenkel defect is a dislocation defect

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C

trapping of an electron in the lattice leads to the formation of F-center

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D

Schottky defects have no effect on the physical properties of solid

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Solution

The correct options are
B

Frenkel defect is a dislocation defect


C

trapping of an electron in the lattice leads to the formation of F-center


Schottky Defect Equal number of anions and cations are missing
No. of ions decreases, volume remains same Density decreases.
Frenkel Defect If an ion is missing from lattice site and occupying interstitial site
Favoured in compounds : favoured in compounds in which there is large difference in size of cations and anions. with low coordination no.

F- centres Sites where anions are missing and instead electrons are present


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