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NEET levelSingle correct optionDifficulty 1 of 3sc167

Which of the following is the most effective in coagulating a positively charged $Fe (OH) X_{3}$ sol?

A $SO X_{4} X^{2 -}$
B $Cl X^{-}$
C $PO X_{4} X^{3 -}$
D $Al X^{3 +}$

Answer: C

A positive sol is coagulated by anions, and the power increases with the charge of the anion (Hardy-Schulze rule). Among the anions the trivalent

PO X_{4} X^{3 -}

is the best.

Al X^{3 +}

has the same sign as the sol and is ineffective.

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