Answer :

(a) When freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution, a positively charged sol of Fe(OH)3 is formed due to adsorption of Fe3+ ions.

(b) On persistent dialysis, a colloidal solution traces of electrolyte is completely removed leaving colloids unstable, and finally, coagulation takes place

(c) On centrifugation of emulsion, separation of the two constituent liquids will take place.

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