Question

Which of the following statements are not true?

(i) Vacancy defect results in a decrease in the density of the substance.

(ii) Interstitial defects results in an increase in the density of the substance.

(iii) Impurity defect has no effect on the density of the substance.

(iv) Frankel defect results in an increase in the density of the substance.

Answer 1

(iii) Impurity defect has no effect on the density of the substance.

(iv) Frankel defect results in an increase in the density of the substance.

Explanation:

(iii) Impurity defect changes the density of substance as impurity has different than the ion present on perfect crystal e.g., When SrCl₂ is added to the NaCl crystal, it causes impurity defect.

(iv) Frenkel defect results neither decrease nor increase in density of substance.