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Question

According to the adsorption theory of catalysis, the rate of reaction increases because :

A

Adsorption lowers the activation energy of the reaction

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B

Concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption

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C

Adsorption produces heat which increases the rate of reaction

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D

Adsorption increases the activation energy of the reaction

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Solution

The correct option is A Adsorption lowers the activation energy of the reaction
According to the adsorption theory of catalysis, the rate of reaction increases because adsorption is the process which decreases the activation energy.
Hence option A is correct.

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Q. Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction?
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
Select the correct answer using the codes given below:

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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