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Among the following the paramagnetic compound is

$\begin{array}{1 1}(a)\;Na_2O_2&(b)\; O_3\\(c)\;N_2O&(d)\;KO_2\end{array}$

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$Na_2O_2\Rightarrow O_2^{-2}(18e^-)$-diamagnetic
$O_3\Rightarrow $diamagnetic
$N_2O\Rightarrow O_2^-(8e^-)$-diamagnetic
$KO_2\Rightarrow O_2^-(17e^-)$(odd $e^-)-$ paramagnetic
Hence (d) is the correct answer.
answered Mar 6, 2014 by sreemathi.v

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