First slide

Heterogeneous mixtures

Question

Which one of the following does not involve coagulation?

Moderate

A

Clotting of blood by the use of ferric chloride
B

Formation of delta
C

Treatment of drinking water by potash alum
D

Peptisation

Solution

(1) Blood is a colloidal sol and is coagulated by FeCl₃.
(2) When two rivers meet, they also carry colloidal sols of opposite charge. There is coagulation.
(3) Potash alum causes coagulation of impurities.
(4) Peptisation is reverse of coagulation and is observed when a common ion is adsorbed on the precipitate.

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