Which is the incorrect statement?

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(D) In $Schottky$ defect,ions leave the lattice,so density decreases. This is a correct statement.$FeO_{0.98}$ shows metal deficiency defect because t

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Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.

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(D) In $Schottky$ defect,ions leave the lattice,so density decreases. This is a correct statement.$FeO_{0.98}$ shows metal deficiency defect because the ratio of $Fe$ to $O$ is less than $1:1$. This is a correct statement.$NaCl_{(s)}$ is an insulator,$Si$ is a semiconductor,$Ag$ is a conductor,and quartz is a piezoelectric crystal. This is a correct statement.Frenkel defect occurs in ionic compounds where there is a large difference in the size of the cation and anion (cation is much smaller than the anion). Therefore,the statement that it is favoured when sizes are almost equal is incorrect.

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