The correct stability order of the following resonance structures is

 

Consider the statements :

I. Bond length in ${{\mathrm{N}}_2}^{+}$ is $0.002$ $\stackrel{\circ }{\mathrm{A}}$ greater than in ${\mathrm{N}}_2$

II. Bond length in ${\mathrm{NO}}^{+}$ is $0.09$ $\stackrel{\circ }{\mathrm{A}}$ less than in $\mathrm{NO}$

III. ${{\mathrm{O}}_2}^{2-}$ has shorter bond length than ${\mathrm{O}}_2$

Which of the following statements are true?

The correct order of bond order values among the following:

$\mathrm{A}. {\mathrm{NO}}^{-} \mathrm{B}. {\mathrm{NO}}^{+} \mathrm{C}. \mathrm{NO} \mathrm{D}. {\mathrm{NO}}^{2+} \mathrm{E}. {\mathrm{NO}}^{2-}$ is

The magnetic moment of  ${\mathrm{KO}}_2$ at room temperature is_______$\mathrm{BM}$.