Which step mentioned below is not considered as fundamental step for the production of nitric acid?

Which step mentioned below is not considered as fundamental step for t

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1.	Which step mentioned below is not considered as fundamental step for the production of nitric acid?
A.	Oxidation of NH<sub>3</sub> to NO
B.	Oxidation of NO to NO<sub>2</sub>
C.	Oxidation of NH<sub>3</sub> to NO<sub>2</sub>
D.	Absorption of NO<sub>2</sub> in water
Answer» D. Absorption of NO<sub>2</sub> in water