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

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

$\mathrm{AlCl}_{3}$
$\mathrm{NaCl}$
$\mathrm{BaCl}_{2}$
$\mathrm{Na}_{3} \mathrm{PO}_{4}$

Correct Option: 1

Solution:

Sulphide is -ve charged colloid so cation with maximum charge will be most effective for coagulation.

$\mathrm{Al}^{3+}>\mathrm{Ba}^{2+}>\mathrm{Na}^{+}$coagulating power.

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