Which of the following statements are not true ?

Options

A. Vacany defect results in a decrease in the density of the substance
B. Interstitial defects results in a n increase in the density of the substace
C. Impurity defect has no effect on the density of the substance
D. Frenkel defect results in an increase in the density of the substance

Answer

C,D

Explanation

Statements(C) and (D) can be correctly written as (C) Impurity defect cahgnes the density of substance as impurity has different than the ion present on prefect crystal e.g., when `SrCl_(2)` is added to the NaCl crystal, it causes impurity defect, (d) Frenkel defect results neither decrease nor increase in density of substance.