Which of the following is the most inappropriate representation of the $p-$nitrophenoxide ion?

During the formation of the dimer $N_2O_4$ from two molecules of $NO_2$,the odd electron on the nitrogen atom of each $NO_2$ molecule pairs up. What is the resulting structure?

All bond lengths are identical in :-

What are the characteristics of resonance structures?

Among the following,the least stable resonance structure is

Which statement is true regarding the $PO_4^{3-}$ ion?
$A$. In $PO_4^{3-}$ ion,the $P-O$ bond order is $1.25$.
$B$. In $PO_4^{3-}$,the formal charge on each $O$ atom is $-0.75$.
$C$. $PO_4^{3-}$ shows four resonating structures.