Identify the type of defect from the following in stainless steel.

The correct statement$(s)$ regarding defects in solids is(are):
$A$. Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion.
$B$. Frenkel defect is a dislocation defect.
$C$. Trapping of an electron in the lattice leads to the formation of $F$-center.
$D$. Schottky defects have no effect on the physical properties of solids.

Assertion : No compound has both Schottky and Frenkel defects.
Reason : Both defects change the density of the solid.

Explain metal deficiency defect.

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

Which of the following point defects are shown by $AgBr_{(s)}$ crystals?
$A$. Schottky defect
$B$. Frenkel defect
$C$. Metal excess defect
$D$. Metal deficiency defect