Which of the following has maximum coagulating power with ferric hydroxide sol?
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a
Cryolite
b
K2C2O4
c
K3Fe(CN)6
d
K4Fe(CN)6
answer is D.
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Detailed Solution
Ferric hydroxide sol is positively charged and is coagulated by negatively charged ion (anion) (1) Na3AlF63NaF⋅AlF3 F− (2) K2C2O4 C2O42− (3) K3Fe(CN)6 Fe(CN)63- (4) K4Fe(CN)6 Fe(CN)64−By Hardy-Schulze rule, coagulating power ofF−