Question

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 catalysts 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 1

Correct Answer: 3

A. The catalyst is diffused over the surface of reactants.

• This statement is incorrect. In heterogeneous catalysis, the catalyst is in a different phase than the reactants. The reactants are adsorbed onto the surface of the catalyst, not the other way around.

B. Reactants are adsorbed on the surface of the catalyst.

• This statement is correct. Adsorption of reactants on the catalyst surface is a crucial step in heterogeneous catalysis.

C. Occurrence of chemical reaction on the catalyst’s surface through formation of an intermediate.

• This statement is correct. The reactants form an intermediate compound with the catalyst on the surface, which subsequently decomposes to form the products.

D. It is a combination of intermediate compound formation theory and the old adsorption theory.

• This statement is correct. The modern adsorption theory combines the concepts of intermediate formation and the old adsorption theory to explain the catalytic process.

E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

• This statement is incorrect. While the modern adsorption theory explains the roles of promoters and poisons, the statement oversimplifies the theory and its application.

Final Answer:

The number of correct statements is 3 (B, C, and D).