What type of colloid is fog?

Jelly is a form of

The colloidal particles can pass through

The Tyndall effect is observed only when the following conditions are satisfied $:$
$1$. The diameter of the dispersed particles is much smaller than the wavelength of the light used.
$2$. The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
$3$. The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
$4$. The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

In the case of small cuts,bleeding is stopped by applying potash alum. Here alum acts as

Among the following,the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is