Arsenic sulfide is a negatively charged sol. Which of the following reagents has the lowest coagulating power for it?

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.

What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?

$A$ liquid scatters light and leaves no residue when passed through filter paper. This liquid can be described as..........

The charge on $As_2S_3$ sol is due to the adsorbed

For a positive sol, which of the following has the maximum coagulation power?