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  4. Arsenic (III) sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?

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Q. Arsenic $(III)$ sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?

Surface Chemistry

Solution:

The more the charge on cation, the more the effectiveness of the electrolyte.