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← ScienceWhich consequence results when a catalyst degrades on a solid support, reducing surface reaction sites?
A)Observed rate constant decreases.✓
B)Activation energy remains unchanged.
C)Equilibrium constant changes significantly.
D)Gas diffusion to surface speeds up.
💡 Explanation
The observed rate constant decreases because fewer active sites are physically available for the catalyzed reaction according to the Arrhenius equation involving the rate constant; therefore, the reaction slows, rather than alters equilibria or activation energy.
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