A) \[\text{NaCl}\]
B) \[KCl\]
C) \[BaC{{l}_{2}}\]
D) \[AlC{{l}_{3}}\]
Correct Answer: D
Solution :
According to Hardy-SchuIze rule, the coagulating power of an electrolyte is directly proportional to the valency of active ions. Hence, to coagulate negative sol of \[\text{A}{{\text{s}}_{\text{2}}}{{\text{S}}_{\text{3}}}\]the coagulating power of different cations decrease as: \[A{{l}^{3+}}>B{{a}^{2+}}>N{{a}^{+}}\]
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