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(C) The $Pt$ sol is a negatively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte increases with the increase

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$AlCl_3$

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(C) The $Pt$ sol is a negatively charged sol. According to the Hardy-Schulze rule,the coagulating power of an electrolyte increases with the increase in the valency of the coagulating ion (the ion carrying a charge opposite to that of the colloidal particles). For a negatively charged sol,the coagulating power of cations follows the order: $Al^{3+} > Mg^{2+} > Na^+$. Among the given options,$AlCl_3$ provides $Al^{3+}$ ions,which have the highest valency and are therefore the most effective for the coagulation of the negatively charged $Pt$ sol.

Which of the following is most effective for the coagulation of $Pt$ sol?

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