Which of the following is the first step in t | vedclass

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(D) The catalytic activity is localised on the surface of the catalyst. The mechanism involves five steps:$(i)$ Diffusion of reactants to the surface

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Diffusion of reactants towards the catalyst surface

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(D) The catalytic activity is localised on the surface of the catalyst. The mechanism involves five steps:$(i)$ Diffusion of reactants to the surface of the catalyst.$(ii)$ Adsorption of reactant molecules on the surface of the catalyst.$(iii)$ Occurrence of chemical reaction on the catalyst surface,through the formation of an intermediate.$(iv)$ Desorption of reaction products away from the catalyst surface.$(v)$ Diffusion of reaction products away from the catalyst surface.Therefore,the first step is the diffusion of reactants towards the catalyst surface.

List-$I$ (Process)	List-$II$ (Catalyst)
$a$. Deacon's process	$i$. $ZSM-5$
$b$. Contact process	$ii$. $CuCl_2$
$c$. Cracking of hydrocarbons	$iii$. $Ni$
$d$. Hydrogenation of vegetable oils	$iv$. $V_2O_5$

Which of the following is the first step in the mechanism of heterogeneous catalysis?

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