$F$-centers are

Frenkel and Schottky defects are

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

In which of the following is impurity defect observed?

The formula of a metal oxide with a metal deficiency defect in its crystal is $A_{0.8}O$. The crystal contains $A^{2+}$ and $A^{3+}$ ions. The fraction of metal existing as $A^{2+}$ ions in the crystal is -

If $NaCl$ is doped with $10^{-3} \, mol \% \, SrCl_2$,what will be the concentration of cation vacancies?