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Question: Answered & Verified by Expert
The most effective coagulating agent among the following for $\mathrm{Sb}_2 \mathrm{~S}_3$ sol is
ChemistrySurface ChemistryTS EAMCETTS EAMCET 2019 (04 May Shift 2)
Options:
  • A $\mathrm{Na}_2 \mathrm{SO}_4$
  • B $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
  • C $\mathrm{NH}_4 \mathrm{Cl}$
  • D $\mathrm{NaCl}$
Solution:
1635 Upvotes Verified Answer
The correct answer is: $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
$\mathrm{Sb}_2 \mathrm{~S}_3$ 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.

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