Chemistry - Surface Chemistry Question with Solution | TestHub

$\mathrm{A}{\mathrm{s}}_2{\mathrm{S}}_3$sol has negatively charged sol particles and therefore, positive ions are effective in causing the coagulating of$\mathrm{A}{\mathrm{s}}_2{\mathrm{S}}_3$sol.
Coagulating efficiencies of electrolytes increase with the increase in the valence of effective ion. Therefore, the best electrolyte for coagulating$\mathrm{A}{\mathrm{s}}_2{\mathrm{S}}_3$sol is$\mathrm{T}\mathrm{h}{\left(\mathrm{S}{\mathrm{O}}_4\right)}_2$.
$\mathrm{N}{\mathrm{a}}^{+}<\mathrm{C}{\mathrm{u}}^{2+}<\mathrm{A}{\mathrm{l}}^{3+}<\mathrm{T}{\mathrm{h}}^{4+}$