Discussion
A rate that passes through a maximum as reactant pressure rises suggests
Answer: C
Correct answer: strong adsorption blocking the surface
A maximum arises when one reactant adsorbs so strongly that raising its pressure further displaces the other from the surface, so the two can no longer meet. Beyond the peak the rate falls even though more reactant is present. It is a signature of competitive adsorption and cannot be produced by any simple power law, which is one of the reasons the Langmuir–Hinshelwood form is used.
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