Which of the following species is isoelectronic with CO?

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N_{2}

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N_{2}^{+}

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O_{2}^{-}

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Solution

The correct option is A $N_{2}$
Isoelectronic species are those species which have same number of electrons. No. of electrons in:
CO: 6+8=14
HF:1+9=10
$N_{2}$ : 7+7=14
$N_{2}^{+}$ :7+7-1=13
$O_{2}^{-}$ :8+8+1=17
CO and $N_{2}$ are isoelectronic
option B

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