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Q.

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
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