Select the incorrect statement.

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(D) In Schottky defect,equal number of cations and anions are missing from the lattice,so the stoichiometry remains unchanged.Frenkel defect is observ

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Density of crystal always increases by doping.

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(D) In Schottky defect,equal number of cations and anions are missing from the lattice,so the stoichiometry remains unchanged.Frenkel defect is observed in ionic compounds where there is a large difference in size between cation and anion,typically associated with low coordination numbers.$F$-centres are anionic vacancies occupied by electrons,which absorb visible light and impart colour to the crystal.Doping does not always increase the density of a crystal; it depends on the nature of the dopant (whether it is an interstitial impurity or a substitutional impurity). Therefore,the statement that density always increases is incorrect.

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