The flocculation value of an electrolyte for a given sol is defined as:

Athe maximum concentration of electrolyte that the sol can tolerate without coagulation
Bthe mass of protective colloid needed to protect 10 mL of the sol
Cthe minimum concentration (in mmol per litre of sol) needed to cause visible coagulation within a fixed time
Dthe charge on one particle of the sol

Answer: C

Flocculation value is the minimum electrolyte concentration, in mmol per litre of sol, that brings about coagulation in a fixed time. A lower flocculation value therefore means greater coagulating power.

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