BITSAT 2018 Slot 2 Solved Paper

In O2 molecule, two electrons are present in antibonding orbitals.
O2(8+8=16)=σ1s2,σ*1s2,σ2s2σ*2s2 σ22pz2,π2px2=π2py2,π*2px=π*2py1
Removal of one electron from the O2 molecule gives O2+ in which the number of antibonding electrons is one less and hence, BO increases. Thus, removal of one electron from O2 stabilises the molecule.