Q. 143.7( 19 Votes )

How are the collo

Answer :

1) Colloidal solutions get classified in 8 Types on the basis of physical state of the dispersed phase and dispersion medium. This are given in following table-







2) Depending upon nature of Particles of dispersed phase it can be classified into 3 categories


a) Multimolecular Colloids-In this colloidal particle consist of aggregates of atoms having diameter less than 1nm.


b) Macromolecular colloids-The colloids in which Large particle aggregates and dissolved into suitable liquid.


c) Associated colloids – This colloids show Colloidal property at higher concentrations. This contains ions of colloidal size.


3) Depending upon interactions between dispersed phase and dispersion medium it is divided into 2 categories


a) Lyophilic Colloids- lyophilic (liquid loving) this colloids formed by direct mixing of substances like gum starch etc. with suitable liquid, called as lyophilic sols . This are called as reversible Colloids because if dispersion medium is separated from the dispersed phase it can be reconstructed just by mixing them. This sols are quite stable. Ex-Protein ,Starch.


b) Lyophobic colloids- lyophobic (liquid hating) this Colloids don't formed by direct mixing of dispersed phase and dispersion media they require special methods for preparation. Ex-Sols of metal sulphides .



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