A) \[BO_{3}^{3-},CO_{3}^{2-},NO_{3}^{-}\]
B) \[SO_{3}^{2-},CO_{3}^{2-},NO_{3}^{-}\]
C) \[C{{N}^{-}},{{N}_{2}},C_{2}^{2-}\]
D) \[PO_{4}^{3-},SO_{4}^{2-},CIO_{4}^{-}\]
Correct Answer: B
Solution :
| Species | Electron in central | Electrons in other element | Charge gained | Total |
| \[BO_{3}^{3-}\] | 5 | \[3\times 8=24\] | +3 | 32 |
| \[CO_{3}^{2-}\] | 6 | \[3\times 8=24\] | +2 | 32 |
| \[NO_{3}^{-}\] | 7 | \[3\times 8=24\] | +1 | 32 |
| \[SO_{3}^{2-}\] | 16 | \[3\times 8=24\] | +2 | 42 |
| \[C{{N}^{-}}\] | 6 | 7 | 1 | 14 |
| \[{{N}_{2}}\] | 7 | 7 | 0 | 14 |
| \[C_{2}^{2-}\] | 6 | 6 | +2 | 14 |
| \[PO_{4}^{3-}\] | 15 | \[4\times 8=32\] | +3 | 50 |
| \[SO_{4}^{2-}\] | 16 | \[4\times 8=32\] | +2 | 50 |
| \[ClO_{4}^{-}\] | 17 | \[4\times 8=32\] | +1 | 50 |
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