Which of the following statements are not true? (i) Vacancy defect results in a decrease in the density of the substance. (ii) Interstitial defects increase the density of the substance. (iii) Impurity defect does not affect the density of the substance. (iv) Frankel defect results in an increase in the density of the substance.
Option 4) Frenkel defect causes vacancy defect at its original site and an interstitial defect at its new location. Therefore, it does not change the density of the solid.
