A) \[SO_{4}^{2-}\]
B) \[PO_{4}^{3-}\]
C) \[A{{l}^{3+}}\]
D) \[N{{a}^{+}}\]
Correct Answer: C
Solution :
Arseneous sulphide solution is a negative sol. \[[A{{s}_{2}}{{S}_{3}}]\,\,{{S}^{2-}}.\] Hence, to coagulate it, a cation is needed. According to Hardy-SchuIze law, coagulation power of \[A{{l}^{3+}}\] will be maximum (as it is trivalent). Hence, its amount required will be the least and therefore, its coagulation value will be least.
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