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NEET 2017

MCQ (More than One Correct Answer)
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.

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