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.


Answer: Three (B, C, D)
Solution: The correct statements are:
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.

Option A is incorrect because the catalyst is not diffused over the surface of reactants. Instead, the reactants are adsorbed on the surface of the catalyst.
Option E is incorrect because while the modern adsorption theory does explain the action of the catalyst, it does not explain the action of catalytic promoters and poisons.

Therefore, the correct answer is three, which includes options B, C, and D.

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