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  4. The ion which is isoelectronic with CO is

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Q. The ion which is isoelectronic with $CO$ is

AIPMTAIPMT 1997Chemical Bonding and Molecular Structure

Solution:

Isoelectronic species are the having same number of electrons.
Number of electrons in $CO =6+8=14$
Number of electrons in $O _{2}^{-}=16+1=17$
Number of electrons in $N _{2}^{+}=14-1=13$
Number of electrons in $O _{2}^{+}=16-1=15$
Number of electrons in $CN ^{-}=6+7+1=14$
Hence, $CO$ isoelectronic with $CN ^{-}$ion.