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Q.

Under the Influence of an electric field the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl,Na2SO4 and Na3PO4 solutions. Their coagulating values will be maximum for 

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a

Na3PO4

b

Na2SO4

c

NaCl

d

Same for all

answer is C.

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Detailed Solution

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The sol particles migrate towards cathode. So they are positively charged hence anions would be effective in coagulation greater is the valence of effective ion smaller will be its coagulating value.

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Under the Influence of an electric field the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl,Na2SO4 and Na3PO4 solutions. Their coagulating values will be maximum for