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

If $N_x$ is the number of bonding orbitals of an atom and $N_y$ is the number of antibonding orbitals,then the molecule/atom will be stable if

Why is $KO_{2}$ paramagnetic?

The theory that can completely/properly explain the nature of bonding in $[Ni(CO)_4]$ is

According to Molecular Orbital Theory,which of the following statements is/are correct?
$(A)$ $C_2^{2-}$ is expected to be diamagnetic
$(B)$ $O_2^{2+}$ is expected to have a longer bond length than $O_2$
$(C)$ $N_2^{+}$ and $N_2^{-}$ have the same bond order
$(D)$ $He_2^{+}$ has the same energy as two isolated $He$ atoms

What is the bond order of the $O_2$ molecule?