Which one of the following electrolytes is most effective for the coagulation of $F e (O H)_{3}$ sol?

N a C l

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N a_{2} S O_{4}

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N a_{3} P O_{4}

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A s_{2} S_{3}

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Solution

The correct option is D $N a_{3} P O_{4}$
$F e (O H)_{3}$ is a positively charged sol. According to Hardy-Schulze rule, greater the charge on an oppositely charged ion of the electrolyte added, more effectively it is in bringing about the coagulation.

Hence, $N a_{3} P O_{4}$ (containing $P O_{4}^{3 -}$ ions) is more effective.

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