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← ScienceWhich outcome increases when reactants exceed catalyst's surface sites?
A)Reaction rate plateaus prematurely✓
B)Equilibrium shifts towards reactants
C)Catalyst deactivation accelerates quickly
D)Activation energy decreases dramatically
💡 Explanation
The reaction rate prematurely plateaus because adsorption, the Langmuir adsorption isotherm mechanism, becomes the limiting factor rather than further reactant increase. Therefore, rate stalls, rather than the equilibrium shifting, as that depends on thermodynamics and not just kinetics within constrained surface catalysis.
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