A) \[PO_{4}^{3-},\,SO_{4}^{2-},\,ClO_{4}^{-}\]
B) \[C{{N}^{-}},\,{{N}_{2}},\,C_{2}^{2-}\]
C) \[SO_{3}^{2-},\,CO_{3}^{2-},\,NO_{3}^{-}\]
D) \[BO_{3}^{3-},\,CO_{3}^{2-},\,NO_{3}^{-}\]
Correct Answer: C
Solution :
\[SO_{4}^{2-}\] has 42 electrons; \[CO_{3}^{2-}\] has 32 electrons; \[NO_{3}^{-}\] has 32 electrons.
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