Question

For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective?

• A. $AlC{l}_3$
• B. $NaCl$
• C. $BaC{l}_2$
• D. $N{a}_{3}P{O}_4$

Answer 1

Answer: (A)

$AlC{l}_3$

Sulphide is$-ve$ charged colloid so cation with maximum charge will be most effective for coagulation.
$A{l}^{3+}>B{a}^{2+}>N{a}^{+}$ coagulatimg power.