Consider the following statements related to colloids. (I) Lyophobic colloids are not formed by simple mixing of dispers…
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
[JEE Advanced 2023, Paper-2]
(I) and (II)
(I) Because there is no contact between the dispersed phase and the dispersion medium in Lyophobic colloids, special procedures are needed for its preparation; simple mixing will not generate it.
(II) Emulsions are colloids which are liquid in liquid type.
(III) When surfactant is dissolved in a suitable solvent, micelles form only at temperatures higher than Kraft's temperature.
(IV) For the Tyndall effect to occur, there must be a significant difference in refractive index between the dispersed phase and the dispersion medium.
Hence, (I) & (II) are correct statements.
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