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Q.

Which is the incorrect statement?

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a

Density decreases in case of crystals with Schottky defect.

b

NaCl(s) is insulator, silicon is semiconductor, 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

FeO0.98has non-stoichiometric metal deficiency defect.

answer is C.

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Detailed Solution

(c,d ) : 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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