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Which of the following ions has the least flocculating power?A. `Cl^(-)`B. `SO_(4)^(2-)`C. `PO_(4)^(3-)`D. `[F(CN)_(6)]^(4-)` |
Answer» Correct Answer - A Generally, the greater the valence of the flocculating ion added, the greater is its power to cause precipitation. This is known as Hardy-Schulze rule. In the coagulation of a negative sol, the flocculating power is in the order: `Al^(3+)gtBa^(2+)gtNa^(+)` . Similarly, in the coagulation of a positive sol, the flocculating power is in the order: `[Fe(CN)_(6)]^(4-)gtPO_(4)^(3-)gtSO_(4)^(2-)gtCl^(-)` |
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