The type of reaction that is typically found when a material that is required for the reaction to proceed, such as a surface or a catalyst, is saturated by the reactants is called a __________ order reaction.

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Accepted Answer

1. When the reactive surface or catalyst is saturated, all active sites are occupied and further increases in reactant concentration do not increase the reaction rate.

2. A reaction whose rate is independent of reactant concentration is called a zero-order reaction.

3. The rate law for a zero-order process is written as $	ext{rate}=k[A]^0=k$, showing no dependence on $[A]$.

4. Examples: surface-catalyzed reactions at high coverage or enzyme-catalyzed reactions under substrate saturation (Michaelis–Menten limit) behave as zero-order in the substrate.

Therefore the correct choice is zero order.

FINAL_ANSWER: c

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