Which of the following is most effective in causing the coagulation of ferric hydroxide sol?

  1. A

    KCI

  2. B

    KNO3

  3. C

    K2SO4

  4. D

    K3Fe(CN)6

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    Solution:

    Fe(OH)3 is positive sol. K3Fe(CN)6 will provide Fe(CN)63 for coagulation having highest magnitude of -ve charge among given options.

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