When electrons are trapped into the crystal in anion vacancy,the defect is known as

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:

$A$ metallic solid undergoes Frenkel defect. Its original mass,volume and density are $M_0$,$V_0$ and $D_0$ respectively. After Frenkel defect the mass,volume and density are $M$,$V$ and $D$ respectively. The variations of $M$,$V$ and $D$ after Frenkel defect are

While writing the formula of ferrous oxide,it is written as $(FeO)$,because it is

Which of the following statements is correct?

Due to vacancy defects,the density of a solid substance .............