Which of the following represents the lattice structure of ${\mathrm{A}}_{0.95}\mathrm{O}$ containing ${\mathrm{A}}^{2+}, {\mathrm{A}}^{3+}$ and ${\mathrm{O}}^{2–}$ ions?

A.

B.

C.
 

Applying the electrical neutrality principle in metal deficiency defect.

One ${\mathrm{A}}^{2+}$ is missing then two ${\mathrm{A}}^{2+}$ ions are converted into ${\mathrm{A}}^{3+}$ ion so $0.05 {\mathrm{A}}^{2+}$ ion are missing and $\left(0.05\times 2\right)$  ${\mathrm{A}}^{2+}$ ion are converted in ${\mathrm{A}}^{3+}$ ion so for each ${\mathrm{O}}^{2-}$ ion total ${\mathrm{A}}^{2+}$ ion $0.85$ and ${\text{A}}^{3+}$ ion is $0.1$.

Hence, A satisfies the condition.