Answer:
Ferric hydroxide sol is positively
charged and to cause its coagulation, ions carrying negative charge are needed.
Since \[PO_{4}^{3-}\] ions have higher
negative charge than \[C{{l}^{-}}\] ions therefore, \[N{{a}_{3}}P{{O}_{4}}\]
coagulates the ferric hydroxide sol most efficiently. This is according to
Hardy-Schulze law. For details, consult Section 5.23.
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