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Applications of Colloids

In the coagul...

Question

In the coagulation of gold sol, which ion has highest fiocculating power?

A

A l^{3 +}

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B

P O_{4}^{3 -}

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C

B a^{2 +}

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D

S O_{4}^{2 -}

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Solution

The correct option is A $A l^{3 +}$
Hardy-Schulze rule : the greater is the valence of the oppositely charged ion of the electrolyte added to a colloidal solution, the faster is the coagulation of the colloidal solution.
Flocculating power is inversely proportional to coagulating power.
For highest flocculating power, coagulating power should be minimum and Al3+ have lowest coagulating power.

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