1.

During change of `O_(2)` to `O_(2)^(2-)` ion, the electrons add on which of the following orbitals ?A. `pi^(**)` orbitalsB. `pi` orbitalsC. `sigma^(**)` orbitalsD. `sigma` orbitals

Answer» Correct Answer - A
`O_(2) overset(+1e^(-))toO_(2)^(-)`
Molecular orbital configuration of `O_(2)`
`sigma1s^(2)sigma^(**)1s^(2)sigma2s^(2)sigm^(**)2s^(2)sigma2p_(z)^(2)pi 2p_x^(2)=pi2p_(y)^(2)`
`pi^(**)2p_x^(1)=pi^(**)2p_(y)^(1)`
therefore incoming `e^(-)` would enter into `pi^(**)2p_(x)` molecular orbital.


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