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

Non-stoichiometric cuprous oxide,$Cu_{2}O$ can be prepared in the laboratory. In this oxide,the copper to oxygen ratio is slightly less than $2:1$. Can you account for the fact that this substance is a $p$-type semiconductor?

Select the incorrect statement for Schottky defect.

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

Which one of the following crystals does not exhibit Frenkel defect?

$NaCl$ is doped with $2 \times 10^{-3} \, mol \% \, SrCl_2$. What is the concentration of cation vacancies?