Which of the following is incorrectly matched?

Point out the false statement.

How will you distinguish between dispersed phase and dispersion medium in an emulsion?

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.

Colour is imparted to glass by mixing

Which of the following is the most effective electrolyte for the coagulation of gold sol?