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Which of the following step(s) is/are not involved in the mechanism of adsorption theory of heterogeneous catalyst?
(i) Diffusion of reactants to the surface of the catalyst.
(ii) Sorption of reactant molecules on the surface of the catalyst.
(iii) Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate.
(iv) Desorption of reaction products from the catalyst's surface.
(v) Diffusion of reaction products away from the catalyst's surface.
(a) (i) only
(b) (ii) and (iv)
(c) (ii) only
(d) (i), (ii) and (v)
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