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Q.

Which is not an example of coagulation

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a

Curdling of milk  

b

Purification of water by alum 

c

Formation of delta at the river banks

d

Rubber plating and chrome tanning 

answer is A.

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Detailed Solution

Coagulation is the phenomenon of the precipitation of a colloidal solution by adding excess of an electrolyte.

Creaming of milk is an example of demulsification.

Therefore, option A is correct.

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