Fog is a colloidal solution of

Identify the correct statements from the following :
$I$. Sulphur sol is an example of a multimolecular colloid.
$II$. Tyndall effect is observed when the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
$III$. The process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane is called peptisation.
$IV$. Eosin,gelatin are examples of negatively charged sols.

If the molecular weight of a compound is increased,then the sensitivity is decreased in which of the following methods?

Fog is an example of which type of colloid?

Explain the following terms:
$(i)$ Electrophoresis
$(ii)$ Coagulation
$(iii)$ Dialysis
$(iv)$ Tyndall effect.

What is the primary test to verify whether a solution is in colloidal form or not?