NEET 2017
Which is the incorrect statement?
A
Density decreases in case of crystals with Schottky defect.
B
NaCl(s) is insulator, silicon is semi conductor, silver is conductor, quartz is piezoelectric crystal.
C
Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
D
FeO0.98 has no-stoichimetric metal deficiency defect.
Explanation
Frenkel defect is favoured in those ionic
compounds in which there is large difference in the
size of cations and anions.
Non-stoichiometric defects due to metal deficiency
is shown by FexO where x = 0.93 to 0.96.