The incorrect statement about the imperfections in solids is:
Schottky defect decreases the density of the substance.
Interstitial defect increases the density of the substance.
Frenkel defect does not alter the density of the substance.
Vacancy defect increases the density of the substance.
As we have learnt,
Schottky defect and Vacancy defect both decrease the density of the solid.
Interstitial defect increases the density of the solid.
Frenkel defect does not change the density of the solld.
So, statements given in Option (1), (2) and (3) are correct but that in Option (4) is incorrect
Hence, Option(4) is the answer.
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