Which of the following are iso-electronic species ?

C O_{2}, N O_{2}

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N O_{2}^{-}, C O_{2}

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C N^{-}, C O

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S O_{2}, C O_{2}

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Solution

The correct option is C $C N^{-}, C O$
$C N^{-}$ and $C O$ are iso-electronic because they have equal number of electrons.
In $C N^{-}$ , the no. of electrons $= 6 + 7 + 1 = 14$
In $C O$ , the no. of electrons $= 6 + 8 = 14$

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Which of the following are iso-electronic and iso-structural?

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