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Arsenic sulphide sol is prepared by passing hydrogen sulphide through arsenic oxide solution. The charge developed on the particles is due to adsorption of

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S^2–

H⁺

OH^–

O^2–

answer is B.

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Detailed Solution

${As}_{2} O_{3} + 3 H_{2} S \to {As}_{2} S_{3} + 3 H_{2} O$

Preferential adsorption of S^2- takes place. So negative charge developed.

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