Which defect leads to an increase in the density of a solid?

Which of the following is $NOT$ a characteristic of Schottky defect?

Potassium crystallizes in an $FCC$ lattice with a unit cell edge length of $0.5 \ nm$. The approximate density (in $g \ cm^{-3}$), if it contains $0.1 \%$ Schottky defects, is:

What is the percentage of $Fe^{3+}$ in $Fe_{0.95}O$?

The defect that arises when smaller cations move into interstitial sites in a crystal lattice is known as ..............

Which among the following solids shows Frenkel defect?