A) \[N{{a}^{+}}>A{{l}^{3+}}>B{{a}^{2+}}\]
B) \[PO_{4}^{3-}>SO_{4}^{2-}>C{{l}^{-}}\]
C) \[Cl>SO_{4}^{2-}>PO_{4}^{3-}\]
D) \[A{{l}^{3+}}>B{{a}^{2+}}>N{{a}^{+}}\]
Correct Answer: D
Solution :
Key Idea: According to Hardy Schuiz rule, the coagulating power of electrolyte increases with charge on ion. \[\because \]\[\text{A}{{\text{s}}_{\text{2}}}{{\text{S}}_{\text{3}}}\] is negatively charged colloid and so it will be coagulated by cations. \[\therefore \]Correct order of coagulating power for \[\text{A}{{\text{s}}_{\text{2}}}{{\text{S}}_{\text{3}}}\]is\[A{{l}^{3+}}>B{{a}^{2+}}>N{{a}^{+}}\]
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