NEET 2003 Chemistry question

Not in JEE Main or NEET syllabus

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

(1)The concentration of reactant molecules at the active centers of the catalyst becomes high due to adsorption
(2)In the process of adsorption, the activation energy of the molecules becomes large
(3)Adsorption produces heat which increases the speed of the reaction
(4)Adsorption lowers the activation energy of the reactionCorrect

Answer: (4)

Solution

In the adsorption theory of heterogeneous catalysis the reactant molecules are adsorbed on the active centres of the solid catalyst. Adsorption weakens the bonds of the adsorbed reactant molecules and brings them close together on the surface, so the reaction proceeds through a path of lower activation energy. A lower

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Question ID VK-089214