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For coagulation of arsenious sulphide sol which one of the following salt solution will be most effective ?

1. AlCl3
2. NaCl
3. Na3PO4
4. BaCl2

Correct answer: AlCl3

Solution

AlCl3 is effective for coagulating arsenious sulphide sol because it provides aluminum ions, which have a high charge density and can neutralize the negative charges on the colloidal particles, leading to their aggregation and precipitation.

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