Which outcome occurs when a platinum catalyst surface becomes saturated with reactant molecules in a chemical reactor?

💡 Explanation

When the catalyst surface is completely covered, the reaction rate becomes independent of reactant concentration because further increases cannot increase surface adsorption, resulting in zero-order kinetics. Therefore rate becoming zero order is the observed outcome, rather than increased activation energy, shifts in equilibrium, or irreversible poisoning, which each depend on specific additional conditions.

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