Among the following molecules / ions $C_2^{2-} ,N_2^{2-} ,O_2^{2-},O_2$ which one is diamagnetic and has the shortest bond length ?

The energy of $\sigma 2{{\rm{p}}_{\rm{z}}}$ molecular orbital is greater than $\pi 2{{\rm{p}}_{\rm{x}}}$ and $\pi 2{{\rm{p}}_{\rm{y}}}$ molecular orbitals in nitrogen molecule. Write the complete sequence of energy levels in the increasing order of energy in the molecule. Compare the relative stability and the magnetic behaviour of the following species : ${{\rm{N}}_2},{\rm{N}}_2^ + ,{\rm{N}}_2^ – ,{\rm{N}}_2^{2 + },$

Give $\mathrm{MO}$ diagram and explain $\mathrm{Ne}_{2}$ molecule is not possible.

The maximum number of hydrogen bonds formed by a water molecule in ice is

The bond order of $O_2^ + $ is the same as in