Which of the following species,$O_2^-$ or $O_2^{2-}$,has a higher bond order?

Number of molecules/species from the following having one unpaired electron: $O_2, O_2^{-}, NO, CN^{-}, O_2^{2-}$

The bond order and magnetic behaviour of $O_{2}^{-}$ ion are,respectively:

Bond order is a concept in the molecular orbital theory. It depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements is true about it? The bond order

What is the bond order in $N_2^{+}$?

Which one of the following molecules is expected to exhibit diamagnetic behaviour?