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Which of the following is more effective...

Which of the following is more effective in coauglating positively charged ferric hyydroxide sol `(i) KCl (ii)FeCl_(3)(iii) K_(4)[Fe(CN_(6)]`?

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`K_(4)[Fe(CN_(6)]` is the most effective because ` "["Fe(CN_(6)]^(-4)`has the maximum coagulating power.
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DINESH PUBLICATION-SURFACE CHEMISTRY -QUESTION FROM BOARD EXAMINATIONS
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