1.

Which one of the following constitutes a group of the isoelectronic species?

A.  \[{{C}^{2-}}_{2},{{O}^{-}}_{2}CO,NO\]
B.  \[N{{O}^{+}}\],\[{{C}^{2-}}_{2},\]\[C{{N}^{-}},\]\[{{N}_{2}}\]
C.  \[C{{N}^{-}},\]\[{{N}_{2}}\],\[{{O}^{2-}}_{2},\]\[{{C}^{2-}}_{2},\]
D.  \[N{{O}_{2}}\],\[{{O}_{2}}\],\[N{{O}^{+}}\],\[CO\]
Answer» C.  \[C{{N}^{-}},\]\[{{N}_{2}}\],\[{{O}^{2-}}_{2},\]\[{{C}^{2-}}_{2},\]


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