Which of the following statements are correct ?

Options

A. The cations occupy more space than atoms in crystal packing
B. In Schottky defect, equal number of cation and anion vacancies are present
C. Ionic solids show change in density due to Frenkel defect.
D. An increase in pressure on `NaCl` crystal, the `6:6` co`-` ordination changes to `8:8` co`-` ordination

Answer

a,b,d

Explanation

In Frenkel defect no ions are missing from the crystal as a whole and thus, there is no charge in density