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-$I$ Catalyst	Column-$II$ Product
$(a)$ $V_2O_5$	$(i)$ Polyethylene
$(b)$ $TiCl_4/Al(Me)_3$	$(ii)$ Ethanal
$(c)$ $PdCl_2$	$(iii)$ $H_2SO_4$
$(d)$ Iron oxide	$(iv)$ $NH_3$

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

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Column-$I$ Catalyst Column-$II$ Product

$(a)$ $V_2O_5$ $(i)$ Polyethylene

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