KCET 2015 Chemistry Solved Paper

Molecular orbital configurations:
O2+(15e−s):
Bond order=

1

2

(10−5)=2.5,and paramagnetic due to one unpaired electron.
O2−(17e−s):
Bond order =

1

2

(10−7)=1.5 and paramagnetic due to one unpaired electron.
Therefore,both O2+ and O2− are paramagnetic and O2+ have higher bond order than O2− Also, O2− is less stable.