The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is ______
A. The catalyst is diffused over the surface of reactants.
B. Reactants are adsorbed on the surface of the catalyst.
C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate.
D. It is a combination of intermediate compound formation theory and the old adsorption theory.
E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.
A. The catalyst is diffused over the surface of reactants.
B. Reactants are adsorbed on the surface of the catalyst.
C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate.
D. It is a combination of intermediate compound formation theory and the old adsorption theory.
E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.
Answer: 3
Solution
In the modern adsorption theory of heterogeneous catalysis the reactants are adsorbed on the catalyst surface, the reaction then proceeds on that surface through an adsorbed intermediate, and the picture combines the intermediate-compound-formation theory with the older adsorption theory. The statement that the catalyst is diffused over the surface of the reactants reverses the roles and is incorrect, and accounting for the action of promoters and poisons is not a feature of this theory. Three of the statements are correct.
JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Integer answer