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 in the order

  1. A

    NaCl>Na2SO4>Na3PO4

  2. B

    Na2SO4>Na3PO4>NaCl

  3. C

    Na3PO4>Na2SO4>NaCl

  4. D

    Na2SO4>NaCl>Na3PO4

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    Solution:

    Since the sol particles migrate towards cathode, 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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