JEE Main 2023ChemistrySurface ChemistryMediumNumerical

JEE Main 2023 — Surface Chemistry Question with Solution

JEE Main 2023 (11 Apr Shift 2)

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 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.

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Show full solutionCorrect answer: 3
Correct answer
3

Step-by-step explanation

Adsorption theory of Heterogeneous catalysis involves five steps-
  1. Diffusion of reactants to the surface of the catalyst.
  2. Adsorption of reactant molecules on the surface of the catalyst. (Occurrence of chemical reaction on the catalyst’s surface through formation of an intermediate.
  3.  Desorption of reaction products from the catalyst surface 
  4. Making the surface available again for more reaction to occur.
  5.  Diffusion of reaction products away from the catalyst’s surface.
So, we can deduce from Adsorption theory of catalysis that as the concentration of reactants at active centres increases due to adsorption and thus the rate of the reaction is also increased.

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About this question

This is a previous-year question from JEE Main 2023, covering the Surface Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.