Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Advanced2007ChemistrySurface ChemistryActual

Statement I Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). Statement II The conductivity of a solution having surfactant molecules deceases sharply at the CMC.

Options

  1. AStatement I is true, Statement II is true, Statement II is a correct explanation for Statement I
  2. BStatement I is true, Statement II is true, Statement II is not a correct explanation for Statement I
  3. CStatement I is true, Statement II is false
  4. DStatement I is false, Statement II is true

Correct answer

B. Statement I is true, Statement II is true, Statement II is not a correct explanation for Statement I

Step-by-step solution

At a certain concentration surfactant molecules start to aggregate and form micelle, the concentration is called critical micellisation concentration (CMC). Aggregation of surfactant molecules (ions; RCOO ⁻ ) micelle formation cause effective fall in number of free ions to conduct electricity, thus, conductivity decreases at CMC.

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