During the formation of the dimer $N_2O_4$ from two molecules of $NO_2$,what happens to the unpaired electron on the nitrogen atom of each $NO_2$ molecule?
- A$A$ weak $N-N$ bond is formed,two $N-O$ bonds become equal,and the other two $N-O$ bonds become unequal.
- B$A$ weak $N-N$ bond is formed and all four $N-O$ bonds become equal.
- C$A$ weak $N-N$ bond is formed and all four $N-O$ bonds become unequal.
- D$A$ strong $N-N$ bond is formed and all four $N-O$ bonds become equal.
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