Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Advanced2022ChemistrySurface ChemistryActual

The correct option(s) related to adsorption processes is(are)

Options

  1. AChemisorption results in a unimolecular layer.
  2. BThe enthalpy change during physisorption is in the range of 100 to 140   kJ   mol - 1 .
  3. CChemisorption is an endothermic process.
  4. DLowering the temperature favours physisorption processes.

Correct answer

A. Chemisorption results in a unimolecular layer.

Step-by-step solution

(A) First statement is correct as chemisorption results in a unimolecular layer and physisorption result in a multimolecular layer. (B) Second statement is incorrect as enthalpy change during physisorption is of the range of 20 - 40 kJmol - 1 .Gases with higher critical temperatures are readily adsorbed (C) Chemisorption is an exothermic process with 80 - 240 kJmol - 1 as the enthalpy of adsorption. (D) Lowering the temperature results in increase in the extent of physisorption.It decreases with increase of tempera

Practice Surface Chemistry on Quantrex Academy →

More from Surface Chemistry

At a given temperature, 0.45 g of acetic acid in 50 mL of water is shaken with 1.0 g of charcoal and the pH of the resulting solution is 3.0 . Assume, the adsorption of acetic acid 2026Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from 10 mg g ⁻¹ and 16 mg g ⁻¹ aqueous phenol solutions, the concent 2025Consider the following statements related to colloids. (I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium. (II) For emulsions, both the 202320 mL of 0 . 5 M NaCl is required to coagulate 200 mL of As 2 S 3 solution in 2 hours. The coagulating value of NaCl is ___________. 2023Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be mu 2023What happens when a lyophilic sol is added to a lyophobic sol? 2023Four gases, A , B , C and D have critical temperatures 5 . 3 , 33 . 2 , 126 . 0 and 154 . 3 K respectively For their adsorption on a fixed amount of charcoal, the correct order is 2023The 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 2023 Full Surface Chemistry list All JEE Advanced PYQs