JEE MAIN - Chemistry (2021 - 31st August Evening Shift - No. 20)
According to molecular orbital theory, the number of unpaired electron(s) in $$O_2^{2 - }$$ is :
Answer
0
Explanation
Molecular orbital configuration of $$O_2^{2 - }$$ is
$$\sigma _{1s}^2\sigma _{1s}^{*2}\sigma _{2s}^2\sigma _{2s}^{*2}\left( {\pi 2p_x^2 = \pi 2p_y^2} \right)\left( {\pi _{2px}^{*2} = \pi _{2py}^{*2}} \right)$$
Zero unpaired electron
$$\sigma _{1s}^2\sigma _{1s}^{*2}\sigma _{2s}^2\sigma _{2s}^{*2}\left( {\pi 2p_x^2 = \pi 2p_y^2} \right)\left( {\pi _{2px}^{*2} = \pi _{2py}^{*2}} \right)$$
Zero unpaired electron
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