Which of the following represents the lattice | vedclass

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(D) In the metal deficiency defect of $A_{0.95} O$,the total charge must be neutral. Let the number of $A^{3+}$ ions be $x$. Then the number of $A^{2+

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$A$ only

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(D) In the metal deficiency defect of $A_{0.95} O$,the total charge must be neutral. Let the number of $A^{3+}$ ions be $x$. Then the number of $A^{2+}$ ions is $(0.95 - x)$.Equating the total positive charge to the total negative charge (which is $2$ for $O^{2-}$):$3x + 2(0.95 - x) = 2$$3x + 1.9 - 2x = 2$$x = 0.1$So,there are $0.1$ $A^{3+}$ ions and $0.85$ $A^{2+}$ ions for every $O^{2-}$ ion.This defect involves the replacement of $A^{2+}$ ions by $A^{3+}$ ions,creating cation vacancies to maintain electrical neutrality. Structure $C$ correctly shows the presence of $A^{2+}$,$A^{3+}$,and a vacant cation site (represented by an empty circle with a dot).

Which of the following represents the lattice structure of $A_{0.95} O$ containing $A^{2+}$,$A^{3+}$,and $O^{2-}$ ions?

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