Among the following electrolytes which is the most effective coagulating agent for Fe(OH)3 sol.

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Among the following electrolytes which is the most effective coagulating agent for $Fe {(OH)}_{3}$ sol.

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${CH}_{3} COONa$

${Na}_{2} {SO}_{4}$

$KCl$

${Na}_{3} {PO}_{4}$

answer is C.

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Detailed Solution

According to Hardy-Schulze rule, coagulation becomes more effective on the addition of the higher opposite charged electrolyte in the solution. $Fe {(OH)}_{3}$ is a positive charged sole and ${Na}_{3} {PO}_{4}$ is known to be the effective coagulation agent as it has a greater $- ve$ charge because of having ${PO}_{4}^{3 -}$ that has $- 3$ charge.