Import Question JSON

$\text{HINT: MOT diagram will tell about unpaired electron.}$ $\text{Explanation:}$ $\text{Step 1:}$ $\text{Draw the MOT diagram of the given species and find the number of unpaired electrons.}$ $\text{The electronic configuration of the given molecules are:}$ $\text{1.) } \text{N}_2^+ = \sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \pi_{2p_x}^2 \approx \pi_{2p_y}^2, \sigma_{2p_z}^1$ $\text{It has one unpaired electron.}$ $\text{2.) } \text{O}_2 = \sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \sigma_{2p_z}^2, \pi_{2p_x}^2 \approx \pi_{2p_y}^2, \pi_{2p_x}^{*1} \approx \pi_{2p_y}^{*1}$ $\text{O}_2 \text{ has two unpaired electrons.}$ $\text{3.) } \text{O}_2^{2-} = \sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \sigma_{2p_z}^2, \pi_{2p_x}^2 \approx \pi_{2p_y}^2, \pi_{2p_x}^{*2} \approx \pi_{2p_y}^{*2}$ $\text{Thus, } \text{O}_2^{2-} \text{ has no unpaired electrons.}$ $\text{4.) } \text{B}_2 = \sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \pi_{2p_x}^1 \approx \pi_{2p_y}^1$ $\text{Thus, } \text{B}_2 \text{ has two unpaired electrons.}$ $\text{Step 2:}$ $\text{O}_2^{2-} \text{ ion does not contain unpaired electrons.}$