JEE Advanced
Chemistry
Surface Chemistry
2023
JEE Advanced 2023 (Paper 2)
JEE Advanced Chemistry Question (2023) — Solution
Question
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
Options
- A. (I) and (II)
- B. (II) and (III)
- C. (III) and (IV)
- D. (II) and (IV)
Step-by-step solution
As in Lyophobic colloids there is no interaction between dispersed phase and dispersion medium, special methods are used for preparation, simple mixing will not form colloid. Emulsion are colloids of liquid dispersed phase and liquid dispersion medium. Micelles formation occurs when temperature is above a particular temperature called Kraft temperature T K and concentration above a particular value know as critical micelle concentration (CMC). Tyndall's effect can be observed when the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
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