JEE Advanced 2023 Chemistry 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
Solution
(I) True – lyophobic sols need special methods (dispersion or condensation); simple mixing does not give them. (II) True – an emulsion is a liquid dispersed in a liquid. (III) False – micelles form only above the critical
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