For elementary bimolecular reaction 2 NO → products, rate law is:
Ak [NO]
Bk [NO]² (molecularity = 2)
Ck
Dk [NO]³
Answer & Solution
Correct answer: B. k [NO]² (molecularity = 2)
For elementary reactions, rate law follows directly from molecularity. 2 NO → ... means rate = k [NO]². For non-elementary (multi-step) reactions, this connection breaks down.
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