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 e

Step-by-step solution

I. Sulphur sol is multimolecular colloid. II. For Tyndall effect to be observed diameter of dispersed particles should not be much smaller than the wavelength of the light used. III. Peptisation is the process of forming stable colloid by using an electrolyte to break up a precipitate and dispersed into the colloids hence, given statement is wrong about peptisation. IV. Eosin and gelatin are examples of negatively charged sol. Hence, option (2) is correct.