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

1. adsorption lowers the activation energy of the reaction
2. the concentration of reactant molecules at the active centres of the catalyst becomes high due to strong adsorption
3. in the process of adsorption, the activation energy of the molecules becomes large
4. adsorption produces heat which increases the speed of the reaction

Correct answer: the concentration of reactant molecules at the active centres of the catalyst becomes high due to strong adsorption

Solution

According to the adsorption theory of catalysis, reactant molecules are adsorbed onto the surface of the catalyst, increasing their concentration at active sites and facilitating the reaction by lowering the activation energy.

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