Choose the pair of elements \([(A)\) to \((F)]\) which:
(i) belong to the Chalcogen family
(ii) form monovalent oxides which give alkalies in aqueous solution
(iii) form stable monovalent anions

\((A)1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^1 \quad (B) 1 s^2 2 s^2 2 p^5 \quad (C) 1 s^2 2 s^2 2 p^6 3 s^1 \quad
(D) 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^6 3 \mathrm{~s}^2 3 \mathrm{p}^5 \quad (E) 1 s^2 2 s^2 2 p^6 3 s^2 3 p^4 \quad (F) 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^4\)

1. A \((i) \mathrm{C} \& \mathrm{F} \quad (ii) \mathrm{A} \& \mathrm{D} \quad (iii) \mathrm{B} \& \mathrm{E}\)
2. B \((i) \mathrm{C} \& \mathrm{D} \quad (ii) \mathrm{A} \& \mathrm{E} \quad (iii) \mathrm{B} \& \mathrm{F}\)
3. C \((i) \mathrm{A} \& \mathrm{C} \quad (ii) \mathrm{B} \& \mathrm{D} \quad (iii) \mathrm{E} \& \mathrm{F}\)
4. D \((i) \mathrm{E} \& \mathrm{F} \quad (ii) \mathrm{A} \& \mathrm{B} \quad (iii) \mathrm{C} \& \mathrm{D}\)