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Pick out among the following species not isoelectronic with $CO_2:$

$\begin{array}{1 1}(a)\;NO_2^-&(b)\;(NCN)^{2-}\\(c)\;(CNO)^-&(d)\;N_3^-\end{array}$

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$CO_2$ is in linear.
$N_3^-,CNO^-,NCN^{2-}$ are in linear.
$NO_2$ is non linear.
Hence (a) is the correct answer.
answered Mar 5, 2014 by sreemathi.v

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