what is the means of coagulation or precipitation ?

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Answer:-
We know lyophobic solution are more stable due to presence of charge on their 
Collaidal particles.If somehow the charge 
is removed,then the collaidal particles come nearer(because in case their is no attractive or repulsive force) to form aggregate(or coagulate)and became settle down under the force of gravity in solution.That process of settling of collaidal particles is called coagulate or precipitation of the solution.

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