Due to the Frenkel defect,the density of a solid $..........$

Schottky defect is generally observed in which type of compounds?

When $AgCl$ is doped with $10^{-4} \, \text{mole percent}$ $RuCl_3$,what will be the concentration of cationic vacancies per mole of $AgCl$?

In ionic compounds where the sizes of the cation and anion are almost similar,which defect is observed?

If an electron is present in place of an anion in a crystal lattice,then it is called

Iron crystallizes in $FCC$ with an edge length of $400 \ pm$. If it contains $0.1 \%$ Schottky defects, calculate its approximate density $[AW \text{ of } Fe = 56 \ g/mol]$. (in $g/cm^3$)