Question

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

(a) the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption

(b) in the process of adsorption, the activation energy of the molecules becomes large

(c) adsorption produces heat which increases the speed of the reaction

(d) adsorption lowers the activation energy of the reaction

Answer 1

Correct option (d) adsorption lowers the activation energy of the reaction

Explanation :

Adsorption causes decrease in surface energy which appears as heat. Thus adsorption is an exothermic process and hence lowers the activation energy of the reaction.