Which of the following molecular orbitals has the maximum number of nodal planes?

Which of the following pairs of species have unpaired electrons in antibonding Molecular Orbital?

Provide the energy level diagram of the molecular orbital obtained by the overlapping of $2p_x^1$ orbitals of two atoms.

If the sum of bond orders of $O_2^{-}$ and $O_2^{2-}$ is $x$,then bond order of $O_2^{2+}$ will be (in $x$)

Among $H_2, He_2^{+}, Li_2, Be_2, B_2, C_2, N_2, O_2^{-}$,and $F_2$,the number of diamagnetic species is (Atomic numbers: $H=1, He=2, Li=3, Be=4, B=5, C=6, N=7, O=8, F=9$)

The bond order and magnetic property of acetylide ion are same as that of $........$.