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Q.

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−
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