Which is the incorrect statement?

Options

A. Density decreases in case of crystals with Schottky 's defect
B. `NaCI(s)` is insulator , sillicon is semiconductor , silver is condictor quarte is piezo electric crystal
C. Frenkel defect as favoured in those ionic compounds in which sizes if cation and anions are almost equal
D. `FeO_(0.98)` has non strichiometric metal deficiency defect

Answer

c

Explanation

(a) In schttky defect mass decreases so density decreases so correct
(b) `NaCI(eq)` is conductor `NaCI(s)` is insulater
(c ) In frankle defect the radius of cation be very less than anion
incorrect statementis (c )
(d) It is a nonstoichiomectric compound with metal difficiency defect