In an ionic crystal,$F$-centers are.....

Frenkel defect is also known as .............

Schottky defect in a crystal is observed when,

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

Give examples of displacement defects in solids.

Which type of crystal defect is observed in the diagram given below?
$Na^{+} Cl^{-} Na^{+} Cl^{-} Na^{+} Cl^{-}$
$Cl^{-} \square Cl^{-} Na^{+} \square Na^{+}$
$Na^{+} Cl^{-} \square Cl^{-} Na^{+} Cl^{-}$
$Cl^{-} Na^{+} Cl^{-} Na^{+} \square Na^{+}$