Detergent action of soap is due to

Which of the following processes is not responsible for the presence of electric charge on the sol particles?

All colloidal dispersions have

Which one of the following is most effective in causing the coagulation of an $As_2S_3$ sol?

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

The most effective coagulating agent for antimony sulphide sol is