Which of the following ionic substances will | vedclass

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(D) According to the Hardy-Schulze law,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge opp

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$Fe_2(SO_4)_3$

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(D) According to the Hardy-Schulze law,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge opposite to that of the colloidal particles).Since the sulphur sol is negatively charged,the positive ion is responsible for coagulation.The valency of the positive ions in the given compounds are:$K^+$ $(+1)$,$Ca^{2+}$ $(+2)$,$Na^+$ $(+1)$,$Fe^{3+}$ $(+3)$.According to the Hardy-Schulze law,the greater the valency of the flocculating ion,the greater is its power to cause precipitation.Therefore,$Fe^{3+}$ ion is the most effective in precipitating the negatively charged sulphur sol.

Which of the following ionic substances will be most effective in precipitating negatively charged sulphur sol? (All compounds are $100\%$ ionized)

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