the pricipitation of collid particle are called-
a. peptisation
b. dialysis
c. cataphoresis
d. coagulation
For authoritative sources, refer to the Wikipedia articles on Peptization (deflocculation) and Flocculation (coagulation).
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(D) Coagulation.
Peptisation, on the other hand (as the now-deleted answers stated), is the opposite of coagulation - it is the dissolution of a precipitate in the presence of an electrolyte, and is also known as deflocculation. Coagulation's other name is flocculation.
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The correct answer is (D) Coagulation.
Peptisation is the dissolution of some precipitate in a solvent, due to the addition of an electrolyte. It is the OPPOSITE of precipitation of colloidal particles.