Which of the following is not paramagnetic?

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Question

(C) Species with unpaired electrons are paramagnetic.$O_2$ has $2$ unpaired electrons in its antibonding $\pi^*$ orbitals.$O_2^{1+}$ has $1$ unpaired

Vedclass · Accepted Answer

$O_2^{2-}$

Vedclass · Answer

(C) Species with unpaired electrons are paramagnetic.$O_2$ has $2$ unpaired electrons in its antibonding $\pi^*$ orbitals.$O_2^{1+}$ has $1$ unpaired electron.$O_2^{-}$ has $1$ unpaired electron.$O_2^{2-}$ (peroxide ion) has $18$ electrons,and its molecular orbital configuration is $(\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\sigma 2p_z)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\pi^* 2p_x)^2 (\pi^* 2p_y)^2$. Since all electrons are paired,it is diamagnetic.

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