What is the correct sequence of the decreasing coagulation value of the following electrolyte fo...

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What is the correct sequence of the decreasing coagulation value of the following electrolyte for the coagulation of ferric hydroxide sol?
(I) \( \mathrm{Na}_{3} \mathrm{PO}_{4} \)
(II) \( \mathrm{KCl} \)
(III) \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
(IV) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(a) IV I III \( \) II
(b) II \( \) III \( \) I \( \) IV \( \quad \) (c) I \( \) II \( \) III \( \) IV
(d) V \( \) III \( \) II \( \) I
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