(i) The phenomenon of accumulation of gas molecules on the surface of solid rather than into the bulk is called adsorption.
(ii) The process of settling of colloidal particles is called coagulaton i.e. conversion of a colloidal solution into a precipitate.
(iii) Lyophobic colloids are those which when mixed with dispersion medium do not form colloids and can be prepared by chemical methods. These are liquid hating substances like metals and their sulphides.
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