In which of the following ionization processes has the bond energy increased and the magnetic behaviour changed from paramagnetic to diamagnetic?

What is the total number of electrons present in bonding orbitals of $O_2$ molecule according to molecular orbital theory?

What is meant by the term bond order? Calculate the bond order of: $N_{2}, O_{2}, O_{2}^{+}$ and $O_{2}^{-}$

The bond order of $O_2^{+}$ is $x$. The bond orders of $O_2^{-}$ and $O_2^{2+}$ are respectively

The number of nodal planes present in $\sigma^{*}s$ antibonding orbitals is

Consider the following changes $I$ and $II$ as shown in the figure. The correct statements about these changes $(I)$ and $(II)$ in accordance with $MO$ theory are:
$A$) In $(I)$ bond order increases by $0.5$ from the existing value.
$B$) In $(II)$ bond order decreases by $0.5$ from the existing value.
$C$) In both $(I)$ and $(II)$ magnetic property is changed.
$D$) In both $(I)$ and $(II)$ magnetic property is not changed.