Step 1: Determine bond order and magnetic nature. 
Step 2: Identify matching properties.
O$_2^-$ and N$_2^-$ both have bond order 2.5 and are paramagnetic.
Regarding the molecular orbital (MO) energy levels for homonuclear diatomic molecules, the INCORRECT statement(s) is (are):
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
