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Question

Which of the following is most effective for coagulation of positively charged colloid?

A
MgCl2
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B
K3PO4
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C
K2SO4
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D
All are equally effective
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Solution

The correct option is A K3PO4

The coagulation capacity depends upon the valency of the active ion, called flocculating ion, which is the ion carrying charge opposite to the charge on the colloidal particles. “According to Hardy Schulze rule, greater the valency of the active ion or flocculating ion, greater will be its coagulating power” thus, Hardy Schulze law states:

(i) The ions carrying the charge opposite to that of sol particles are effective in causing coagulation of the sol.

(ii) Coagulating power of an electrolyte is directly proportional to the valency of the active ions (ions causing coagulation).

Similarly, to coagulate a positive sol such as Fe(OH)3 , Similarly, to coagulate a positive sol such as

PO43>SO42>Cl.


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