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 liquids.
(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 almost same refractive index as that of the dispersion medium.
The option with the incorrect set of statements is

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(I) and (II)

(II) and (IV)

(III) and (IV)

(II) and (III)

answer is C.

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Detailed Solution

(I) As in Lyophobic colloids there is no interactionbetween dispersed phase and dispersion medium,special methods are used for preparation, simplemixing will not form colloid.(II) Emulsions are liquid in liquid type colloids.(III) Dissolving surfactant in a proper solvent willonly form micelles at temperature above Kraft'stemperature.(IV) For Tyndall effect there must be a largedifference in refractive index between dispersedphase and dispersion medium in order to havediffraction of light.Hence ans (I) & (II) are correct.

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