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Which of the following electrolytes is m...

Which of the following electrolytes is most effective for the coagulation of `Fe(OH)_3` sol and why? `NaCl, Na_2 SO_4, Na_3 PO_4`

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.A n s: Fe(OH)_3. is a positively charged sol. According to Hardy - Sehulze rule, for the congulation of +ve sol ._4. an electrolyte with a negative ion carrying maxtmún negative charge will.be most effective. Hénce .dotN a_3 PO_4. having .PO_4^3-. will be effective in causing coagulation of .Fe(OH)_3^+. sol.
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