JEE Advance - Chemistry (2009 - Paper 1 Offline - No. 10)
The correct statement(s) regarding defects in solids is (are)
Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion.
Frenkel defect is a dislocation defect.
Trapping of an electron in the lattice leads to the formation of F-centre.
Schottky defects have no effect on the physical properties of solids.
Explanation
Frenkel defect occurs in compounds in which the anions are much larger in size than cations. It is a dislocation effect. The presence of Schottky defects lowers the density of the crystal, it hence affects the physical properties of the crystal. In the metal excess defects, the electrons trapped in anion vacancies are known as F-centres.
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