Chemistry - Mole Concept Question with Solution | TestHub

Species having the same number of electrons called as isoelectronic species. By calculating the number of electrons in each species given here, we get

$\text{C}{\text{N}}^{-}\left(6+7+1=14\right);{\text{N}}_2\left(7+7=14\right);$

${\text{O}}_2^{2-}\left(8+8+2=18\right);{\text{C}}_2^{2-}\left(6+6+2=14\right);$

${\text{O}}_2^{-}\left(8+8+1=17\right);\text{N}{\text{O}}^{+}\left(7+8-1=14\right)$

$\text{C}\text{O}\left(6+8=14\right);\text{N}\text{O}\left(7+8=15\right)$

From the above calculation we find that all the species listed in choice c have 14 electrons each so it is the correct answer.