Which of the following cations will have the | vedclass

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(D) The minimum amount of an electrolyte that must be added to one litre of a colloidal solution to bring about complete coagulation is called the coa

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$Al^{3+}$

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(D) The minimum amount of an electrolyte that must be added to one litre of a colloidal solution to bring about complete coagulation is called the coagulation or flocculation value of the electrolyte.According to the Hardy-Schulze rule,the greater the valency of the coagulating or flocculating ion,the smaller the quantity of the electrolyte required to coagulate a definite amount of the colloidal sol.Arsenic sulphide sol is a negatively charged sol.Therefore,it is coagulated by cations.The effectiveness of cations follows the order: $Al^{3+} > Ca^{2+} = Mg^{2+} > Na^{+}$.Since the flocculation value is inversely proportional to the coagulating power,the order of flocculation value is: $Na^{+} > Ca^{2+} = Mg^{2+} > Al^{3+}$.Thus,$Al^{3+}$ has the minimum flocculation value.

Which of the following cations will have the minimum flocculation value for arsenic sulphide sol?

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