Which of the following salt solutions would c | vedclass

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(A) When $FeCl_{3}$ is added to $NaOH$ in excess,a negatively charged ferric hydroxide sol $[Fe(OH)_{3} \cdot OH^-]$ is formed.According to the Hardy-

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$10 \ mL$ of $0.2 \ mol \ dm^{-3} \ AlCl_{3}$

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(A) When $FeCl_{3}$ is added to $NaOH$ in excess,a negatively charged ferric hydroxide sol $[Fe(OH)_{3} \cdot OH^-]$ is formed.According to the Hardy-Schulze rule,the coagulating power of an ion increases with the increase in the magnitude of its charge.For a negatively charged sol,the coagulating power of cations follows the order: $Al^{3+} > Ca^{2+} > Na^+$.Among the given options,$AlCl_{3}$ provides $Al^{3+}$ ions,which have the highest charge and thus the highest coagulating power,leading to the fastest rate of coagulation.

Which of the following salt solutions would coagulate the colloid solution formed when $FeCl_{3}$ is added to $NaOH$ solution,at the fastest rate?

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