Which of the following is paramagnetic?

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(C) Paramagnetism is the property of a substance that contains one or more unpaired electrons.$1.$ $NO^{+}$: Total electrons = $7 + 8 - 1 = 14$. Molec

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$O_2^-$

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(C) Paramagnetism is the property of a substance that contains one or more unpaired electrons.$1.$ $NO^{+}$: Total electrons = $7 + 8 - 1 = 14$. Molecular orbital configuration: $(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s)^2, (\sigma^* 2s)^2, (\sigma 2p_z)^2, (\pi 2p_x)^2, (\pi 2p_y)^2$. All electrons are paired,so it is diamagnetic.$2.$ $CO$: Total electrons = $6 + 8 = 14$. Similar to $NO^{+}$,all electrons are paired,so it is diamagnetic.$3.$ $O_2^-$: Total electrons = $8 + 8 + 1 = 17$. Molecular orbital configuration: $(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s)^2, (\sigma^* 2s)^2, (\sigma 2p_z)^2, (\pi 2p_x)^2, (\pi 2p_y)^2, (\pi^* 2p_x)^2, (\pi^* 2p_y)^1$. It contains one unpaired electron in the $\pi^* 2p_y$ orbital,making it paramagnetic.$4.$ $CN^{-}$: Total electrons = $6 + 7 + 1 = 14$. Similar to $CO$,all electrons are paired,so it is diamagnetic.

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