JEE Advanced 2023 Paper 2 Q02 Chemistry Physical Chemistry Solutions & Colligative Properties Medium

JEE Advanced 2023 Paper 2 · Q02 · Solutions & Colligative Properties

Consider 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 dispersed phase and the dispersion medium are liquid. (III) Micelles are produced by dissolving a surfactant in any solvent at any temperature. (IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium. The option with the correct set of statements is

  1. A. (I) and (II)
  2. B. (II) and (III)
  3. C. (III) and (IV)
  4. D. (II) and (IV)
Reveal answer + step-by-step solution

Correct answer:A

Solution

(I) TRUE — lyophobic colloids require special preparation methods (Bredig's arc, peptisation, etc.) — simple mixing won't form them. (II) TRUE — emulsions are liquid-in-liquid dispersions. (III) FALSE — micelles form only above the critical micelle concentration AND above the Kraft temperature, not at any temperature. (IV) FALSE — Tyndall effect requires a refractive index difference between dispersed phase and medium for scattering. So only (I) and (II) are correct.

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