The bond energies in $NO$,$NO^{+}$,and $NO^{-}$ follow the order:

Which of the following statements is not correct according to molecular orbital theory $:-$

The formation of molecular orbitals can be described by the linear combination of atomic orbitals. Which one of the following correctly represents the formation of bonding molecular orbital from the atomic orbitals having wave functions $\psi_A$ and $\psi_B$?

The internuclear distances in $O-O$ bonds for $O_2^+$,$O_2$,$O_2^-$ and $O_2^{2-}$ respectively are

According to "molecular orbital theory",which among the following diatomic molecules only has $\pi$-bonds?

During the change of $O_2$ to $O_2^-$ ion,the electron adds to which one of the following orbitals?