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) absorption produces heat which increases the speed of the reaction
D) adsorption lowers the activation energy of the reaction
Correct Answer: A
Solution :
The reactant gaseous molecules are adsorbed on the surface by these free bonds. This accelerates the rate of the reaction. The distribution of free bonds on the catalyst surface is not uniform. These are crowded at the 'peaks', 'cracks' and comers of the catalyst. The catalytic activity due to adsorption of reacting molecules is maximum at these spots. These are, therefore, referred to as the active centres.
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