A) \[C{{N}^{-}},{{N}_{2}},O_{2}^{2-},C_{2}^{2-}\]
B) \[{{N}_{2}},O_{2}^{-},N{{O}^{+}},CO\]
C) \[C_{2}^{2-},O_{2}^{-},CO,NO\]
D) \[N{{O}^{+}},C_{2}^{2-},C{{N}^{-}},{{N}_{2}}\]
Correct Answer: D
Solution :
Isoelectronic species possess same number of electrons. \[N{{O}^{+}},C_{2}^{2-},C{{N}^{-}}\] and \[{{N}_{2}}\], each have 14 electrons and thus are isoelectronic.
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