AP EAMCET202125 Aug 2021Evening ShiftChemistrySolid StateActual
Identify the incorrect statement regarding crystals having Frenkel defect.
Options
- AFrenkel defects are observed where the difference in sizes of cations and anions is large.
- BThe density of crystals having Frenkel defect is less than that of a pure perfect crystal.
- CAn ionic crystal having Frenkel defect may also contain Schottky defect.
- DAlkali halides do not usually have Frenkel defect.
Correct answer
B. The density of crystals having Frenkel defect is less than that of a pure perfect crystal.
Step-by-step solution
In Frenkel defect density remain constant. It is a defect of a cation or an anion is dislocated from its normal site to interstitial site. Interstitial site is the place between the lattice sites. This defect is observed in solids when the difference in ionic radius of two ions is very large. Hence, the density of crystals having Frenkel defect is less than that of pure perfect crystal.