Which of the following will have the highest coagulating power for the colloid $F e (O H)_{3}$ ?

P O_{4}^{3 -}

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S O_{4}^{2 -}

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C a^{2 +}

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A l^{3 +}

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Solution

The correct option is A $P O_{4}^{3 -}$
$F e (O H)_{3}$ is a positive sol. Hence, greater the charge on anion, more is the coagulation power.

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