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  4. Which of the following salt is most effective in the coagulation of an arsenious sulphide sol?

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Q. Which of the following salt is most effective in the coagulation of an arsenious sulphide sol?

NTA AbhyasNTA Abhyas 2022

Solution:

Arsenious sulphide is -ve charged colloid. Hence, cation having maximum positive charge will be most effective for coagulation. (Hardy Schulz rule)
$Al^{3 +}>Ba^{2 +}>Na^{+}$ (coagulating power)