Maximum unpaired electrons are present in

Which of the following molecular orbitals has two nodal planes

Of the species, $NO , NO ^{+}, NO ^{2+}, NO ^{-},$ the one with minimum bond strength is :

Among the following species$N _{2}, N _{2}^{+}, N _{2}^{-}, N _{2}{ }^{2-}, O _{2}, O _{2}{ }^{+}, O _{2}^{-}, O _{2}{ }^{2-}$ the number of species showing diamagnetism is.

When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule