AP EAPCET 04-Jul-2022 Shift 2 Paper

A. Frenkel defects is a defect in which an atom/ion occupies a normally vacant site other. than its own. This defect is possible if the cations are smaller in size as compared to the anions. Size of Ag+is smaller than Cl⊖ so, it shows Frenkel defect.
B. Schottky defects is a type of defect in which both cations and anions remain missing from their lattice sites in equal numbers. This is possible if size of both ions is nearly same. Size of Na+is equal to size of Cl⊖ so, it shows Schottky defect.
C. Vacancy defects is a defect in which crystals have vacant sites.
D. Metal deficiency defects, in this solids have less number of metals, FeO shows metal deficiency defect due to variable oxidation state of Fe.
Hence, the correct match is

List I (Defects)	List II (Examples)
A. Frenkel defects	(III) AgCl
B. Schottky defects	(II) NaCl
C.Vacancy defects	(IV) Crystals with vacant lattice sites
D. Metal deficiency defects	(I) FeO