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Theories of Catalysis

According to ...

Question

According to the adsorption theory of catalysis, the speed of the reaction increase because :

A

The concentration of reactant molecules at the active centers of the catalyst becomes high due to adsorption

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B

In the process of adsorption, the activation energy of the molecules becomes large

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C

Adsorption produces heat which increases the speed of the reaction

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D

Adsorption lowers the activation energy of the reaction.

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Solution

The correct option is D Adsorption lowers the activation energy of the reaction.
In the presence of the catalyst, the speed of reaction increases. Since the activation energy gets reduced and hence the rate of adsorption increases.

The correct answer is $D$ .

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I. A catalyst provides proper orientation for the reactant molecules to react
II. Heat of adsorption of reactants on a catalyst helps reactant molecules to.overcome activation energy
III. The catalyst increases the activation energy of the reaction
IV. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst
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Q. Which of the following factors are responsible for the increase in the rate of a surface catalyzed reaction?
(i) A catalyst provides proper orientation for the reactant molecules to react.
(ii) The heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy.
(iii) The catalyst increases the activation energy of the reaction.

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2)Heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy
3)The catalyst increases the activation energy of the reaction
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