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← ScienceWhich consequence decreases reaction rate in fuel cells?
A)Catalyst surface poisoning reduces active sites✓
B)Increasing temperature enhances molecule kinetic energy
C)Higher pressures increase reactant concentration
D)Smaller molecules have lower activation energy
💡 Explanation
Catalyst poisoning lowers reaction rate through adsorption, which blocks available active sites because site availability decreases the effective area of the reaction. Therefore, poisoning will slow the reaction rate rather than promote it or change activation energy.
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