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(A) Since the sol particles migrate towards the cathode,they are positively charged.According to the Hardy-Schulze law,the coagulating power of an ion

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$NaCl > Na_2SO_4 > Na_3PO_4$

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(A) Since the sol particles migrate towards the cathode,they are positively charged.According to the Hardy-Schulze law,the coagulating power of an ion is directly proportional to its valency.For a positively charged sol,the effective coagulating ions are the anions: $Cl^-$,$SO_4^{2-}$,and $PO_4^{3-}$.The coagulating power order is $PO_4^{3-} > SO_4^{2-} > Cl^-$.Since the coagulating value is inversely proportional to the coagulating power,the order of coagulating values is $NaCl > Na_2SO_4 > Na_3PO_4$.

Under the influence of an electric field,the particles in a sol migrate towards the cathode. The coagulation of the same sol is studied using $NaCl$,$Na_2SO_4$,and $Na_3PO_4$ solutions. Their coagulating values will be in the order:

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