The most effective coagulating agent for antimony sulphide sol is
- A
$\mathrm{Na}_2 \mathrm{SO}_4$
- B
$\mathrm{CaCl}_2$
- C
$\mathrm{NH}_4 \mathrm{Cl}$
- D
$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$
✓ Correct answer: D
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