Which of the following has maximum coagulating power in the coagulation of positively charged sol?

The migration of positively charged colloidal particles under an electrical field towards the cathode is called:

The $Purple \ of \ Cassius$ is $......$.

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

Which of the following can form a cationic micelle?

Match the following List-$I$ (Dispersed Phase - Dispersion medium) with List-$II$ (Type of colloid):
| List-$I$ | List-$II$ |
| :--- | :--- |
| $(A)$ Solid - Liquid | $(I)$ Gel |
| $(B)$ Liquid - Liquid | $(II)$ Aerosol |
| $(C)$ Solid - Gas | $(III)$ Sol |
| $(D)$ Liquid - Solid | $(IV)$ Emulsion |