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Among the electrolytes $\mathrm{Na}_2 \mathrm{SO}_4, \mathrm{CaCl}_2 \quad \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$ and $\mathrm{NH}_4 \mathrm{Cl}$, the most effective coagulating agent for $\mathrm{Sb}_2 \mathrm{~S}_3$ sol is
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$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
$\mathrm{Sb}_2 \mathrm{~S}_3$ is an anionic $\mathrm{sol}_2$, therefore cation of highest valency ( $\mathrm{Al}^{3+}$ in the present case) would be most effective coagulating agent.
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