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← ScienceWhich outcome occurs when reactants struggle to access catalyst active sites?
A)Reaction rate becomes diffusion limited✓
B)Catalyst surface area decreases rapidly
C)Activation energy increases unexpectedly
D)Product selectivity is greatly improved
💡 Explanation
The reaction rate becomes mass-transport or diffusion limited because insufficient reactants can reach the active sites; therefore the observable rate is not determined by the chemical kinetics, rather than true catalyst performance under ideal conditions.
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