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Q.

Fe(OH)3 sol is formed by hydrolysis of FeCl3. Which has maximum coagulating power to Coagulate Fe(OH)3 sol?

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a

KI

b

K2SO4

c

K3PO4

d

K4Fe(CN)6

answer is D.

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Detailed Solution

Fe(OH)3 sol is positively charged due to adsorption of Fe3+ion.FeCl3+3H2O⟶Fe(OH)3+3HClFe(OH)3+FeCl3⟶Fe(OH)3Fe3+:3Cl−By Hardy-Schulze rule, positively charged colloidal sol is coagulated by negatively charged ions. Larger the charge larger the coagulating power.I−
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Fe(OH)3 sol is formed by hydrolysis of FeCl3. Which has maximum coagulating power to Coagulate Fe(OH)3 sol?