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Which mechanism decreases the activation energy of a solid catalyst in a chemical reactor?

A)Adsorption of reactant molecules onto the surface
B)Maintaining high operational reactor pressure
C)Increasing the temperature for reactant dissociation
D)Removing product molecules to shift equilibrium

💡 Explanation

When reactants adsorb on the catalyst's surface, surface interactions weaken intramolecular bonds, reducing the energy needed for the reaction because it stabilizes the transition state. Therefore, adsorption decreases activation energy, rather than pressure, temperature, or product removal which influence reaction rate through different means.

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