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.

Column-$I$	Column-$II$
$A$. Haber's process for ammonia	$P$. Zeolite
$B$. Oswald's process for $HNO_3$	$Q$. $Fe$
$C$. Contact process for $H_2SO_4$	$R$. $V_2O_5$
$D$. Cracking of hydrocarbons	$S$. $Pt$ gauge

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

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