CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
In a surface‐catalyzed reaction, which of the following best describes the role of the adsorption step?
(a) It converts reactant molecules into gaseous free radicals that diffuse to the surface.
(b) It removes catalyst atoms from the lattice, creating additional vacancies for reactants.
(c) It orients reactant molecules on active sites, enabling formation of a surface‐bound intermediate.
(d) It weakens product–surface interactions, accelerating desorption of products from the catalyst.