According to the adsorption theory of catalysis, the speed of the reaction increases because
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a
Adsorption produces heat which increases the speed of the reaction
b
Adsorption lowers the activation energy of the reaction
c
The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
d
In the process of adsorption, the activation energy of the molecules becomes large
answer is B.
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Detailed Solution
Reactant molecules (gases) get adsorbed on the surface of the catalyst.concentration of reactants on the surface increases, Activation energy decreases.Hence rate increases