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Elementary Reaction Order

APCHEM-6YTDLG

For the reaction shown, which of the following BEST describes the elementary reaction?

$$2N_2O_5 \leftrightarrow 4NO_2+ O_2$$

A

First order unimolecular.

B

Second order unimolecular.

C

Second order bimolecular.

D

First order bimolecular.