Question

The correct statement regarding defects in crystalline solids is

(a) Frenkel defects decrease the density of crystalline solids

(b) Frenkel defect is a dislocation defect

(c) Frenkel defect is found in halides of alkaline metals

(d) Schottky defects have no effect on the density of crystalline solids

Answer 1

Correct option (b) Frenkel defect is a dislocation defect

Explanation :

Frenkel defect is a dislocation defect as smaller ions (usually cations) are dislocated from normal sites to interstitial sites. Frenkel defect is shown by compounds having large difference in the size of cations and anions hence, alkali metal halides do not show Frenkel defect. Also, Schottky defect decreases the density of crystal while Frenkel defect has no effect on the density of crystal.