Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol?

According to Hardy-Schulze rule, greater the charge of the flocculating ion, greater is its ability to bring coagulation.

Here, in all of these, cation Na+ has equal charge = +1.


In (i), the anion is S2-


In (ii), the anion is PO43-.


In (iii), the anion is SO42-


In (iv), the anion is Cl-.


So highest charge of anion in option (ii). So (ii) is the correct option.


(i), (ii) and (iv) wrong according to Hardy-Schulze rule.

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