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Which ion has the least coagulation value (i.e., the highest coagulating power) for a positively charged colloidal sol?

1. [Fe(CN)6]⁴-
2. Cl-
3. SO4²-
4. PO4³-

Correct answer: [Fe(CN)6]⁴-

Solution

[Fe(CN)6]⁴- has the highest charge magnitude (4-) among the options, giving it the greatest coagulating power for a positive sol by Hardy-Schulze rule, and therefore the lowest coagulation value.

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