Molecular Orbital Theory — Prelims Questions

Which of the following species has a bond order of 2.5?

Which of the following species is diamagnetic?

Which of the following statements about Molecular Orbital Theory is INCORRECT?

Arrange the following species in increasing order of bond length: $O_2^{2-}$, $O_2^-$, $O_2$, $O_2^+$

Which of the following diatomic molecules is expected to be unstable?

Which of the following pairs of species have the same bond order?