The minimum amount of an electrolyte in______ that must be added to one litre of a colloidal solution so as to cause its complete coagulation in two hours is called the precipitation or coagulation value of the electrolyte.

Options

A. milligrams
B. moles
C. milli moles
D. grams

Answer

C

Explanation

The coagulatoin of a colloidal solution by an electrolyte does not take place until the added electrolyte has certain minimum concentration in the solution. The minimum concentration of an electrolyte in millimoles per litre required to cause precipitation of a sol in two hours is called coagulating value. The smaller the quantity needed, the higher will be the coagulating power of an ion.