The particles of a particular colloidal solution of arsenic trisulphide (As2S3) are negatively charged. Which 0.0005M solution of the following salts would be most effective in coagulating this colloidal solution?
Correct answer: C. AlCl3
- A. KCl
- B. MgCl2
- C. AlCl3
- D. Na3PO4
Explanation
Since As2S3 is a negatively charged colloidal sol, hence positively charged ion will cause its coagulation. By Hardy−Schulze rule "greater the charge on ion, greater the coagulating power to coagulate oppositely charged colloidal sol", hence out of K+ , Mg2+ , Al3+ and Na+ , Al3+ would be most effective in coagulating this colloidal solution.
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