Chemical Bonding And Molecular Structure Ques 8
8. During change of $O_2$ to $O_2^{-}$ion, the electron adds on which one of the following orbitals?
[2012 M]
(a) $\pi^{*}$ orbital
(b) $\pi$ orbital
(c) $\sigma^{*}$ orbital
(d) $\sigma$ orbital
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Answer:
Correct Answer: 8.(a)
Solution:
(a) $O_2=K K(\sigma 2 s)^{2}(\sigma^{*} 2 s)^{2}(\sigma 2 p_z)^{2}$
$ \hspace{10mm} (\pi 2 p_x)^2 (\pi 2 p_y)^2 (\pi^* 2 p_x)^1 (\pi^* 2 p_y)^1$
$O_2^{-}=K K(\sigma 2 s)^{2}(\sigma^{*} 2 s)^{2}(\sigma 2 p_z)^{2}$
$ \hspace{10mm} (\pi 2 p_x)^2(\pi 2 p_y)^2(\pi^* 2 p_x)^2(\pi^* 2 p_y)^1$
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