A Possible Mechanism for the Gas Phase Reaction of NO

question 102

Multiple Choice

A possible mechanism for the gas phase reaction of NO and H₂ is as follows:
Step 1
2NO
N₂O₂
Step 2
N₂O₂ + H₂
N₂O + H₂O
Step 3
N₂O + H₂
N₂ + H₂O
Which of the following statements concerning this mechanism is not directly supported by the information provided?

• A)Step 1 is the rate determining step.
• B)N₂O₂ is an intermediate.
• C)There is no catalyst in this reaction.
• D)The rate expression for step 1 is rate = k[NO]².
• E)All steps are bimolecular reactions.

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