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  4. Arsenic sulphide sol is prepared by passing H2S through As2O3 solution. The charge developed on sol particles is due to the adsorption of

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Q. Arsenic sulphide sol is prepared by passing $H_{2}S$ through $As_{2}O_{3}$ solution. The charge developed on sol particles is due to the adsorption of

NTA AbhyasNTA Abhyas 2020Surface Chemistry

Solution:

$As_{2}O_{3}+3H_{2}S \rightarrow \underset{\left(\right. s o l \left.\right)}{A s_{2} S_{3}}+3H_{2}O$

$H_{2}S$ molecules get adsorbed on $As_{2}S_{3}$ sol particles. Enthalpy of adsorption dissociates $H_{2}S$ to form $H^{+}$ and $S^{2 -}$ . $H^{+}$ ions are lost and $S^{2 -}$ ions remain adsorbed on the surface sol particles.