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The most effective coagulating agent among the following for $\mathrm{Sb}_2 \mathrm{~S}_3$ sol is
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$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
$\mathrm{Sb}_2 \mathrm{~S}_3$ is a negative sol, means negative charge is spread over the surface of $\mathrm{Sb}_2 \mathrm{~S}_3$ molecules. Thus, positive ions, having high charge density can easily coagulate them. Since, $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$ has highest positive charge density over $\mathrm{Al}^{3+}$ ions.
Thus, $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$ is most effective coagulating agent for $\mathrm{Sb}_2 \mathrm{~S}_3$ sol.
Thus, $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$ is most effective coagulating agent for $\mathrm{Sb}_2 \mathrm{~S}_3$ sol.
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