JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sc104
Select all correct statements about heterogeneous catalysis.
AA promoter decreases the activity of a catalyst.
BUsing a finely divided solid catalyst increases the rate by providing more surface area and active centres.
CA catalytic poison increases the number of active centres on the surface.
DReactants are chemisorbed on the catalyst surface, which weakens their bonds and makes reaction easier.
Answer: B, D
Promoters enhance catalyst activity, and poisons block active centres, so A and C are false. More surface area means more active sites (B), and chemisorption of reactants forms surface bonds that weaken bonds in the reactant (D).