Question

The incorrect statement about the imperfections in solids is:

• A. Schottky defect decreases the density of the substance.
• B. Interstitial defect increases the density of the substance.
• C. Frenkel defect does not alter the density of the substance.
• D. Vacancy defect increases the density of the substance.

Answer 1

Answer: (D)

Vacancy defect increases the density of the substance.

Answer 2

The correct answer is (D) : Vacancy defect increases the density of the substance.
When constituent particles occupy the interstitial location, interstitial defect arises. This increases the density of substance. Frenkel defect occurs when constituent particles occupy the interstitial site.
It creates vacancy defect at original and interstitial defect at the new location. It does not change the density of crystal.
Due to vacancy defect density of the substance will decrease.