Answer:
When gaseous molecules come in contact
with. the surface of a solid catalyst, a weak chemical bond is formed between
the surface (catalyst) molecules and reactant (gas) molecules. Thus,
concentration of reactant molecules increases at the surface.
The rate of reaction increases by
adsorption of different molecules side by side facilitating the chemical
reaction. Adsorption, being exothermic also help in increasing the rate of reaction
(chemisorption increases with rise in temperature).
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