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Match the columns
Column-I Column-II
(A) Impurity defect
(p) \( \mathrm{NaCl} \) with anionic sites
F-centres
(B) Metal excess defect
(q) \( \mathrm{FeO} \) with \( \mathrm{Fe}^{3+} \)
(C) Metal deficiency
(r) \( \mathrm{NaCl} \) with \( \mathrm{Sr}^{2+} \) and some defect cationic sites vacant
(a) \( \mathrm{A}-(\mathrm{r}), \mathrm{B}-(\mathrm{p}), \mathrm{C}-(\mathrm{q}) \)
(b) \( \mathrm{A}-(\mathrm{p}), \mathrm{B}-(\mathrm{q}), \mathrm{C}-(\mathrm{r}) \)
(c) \( \mathrm{A}-(\mathrm{r}), \mathrm{B}-(\mathrm{q}), \mathrm{C}-(\mathrm{p}) \)
(d) \( \mathrm{A}-(\mathrm{q}), \mathrm{B}-(\mathrm{p}), \mathrm{C}-(\mathrm{r}) \)
\( \mathrm{W} \)
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