A) \[N{{a}^{+}}\]
B) \[M{{g}^{2+}}\]
C) \[C{{a}^{2+}}\]
D) \[A{{l}^{3+}}\]
Correct Answer: D
Solution :
: According to Hardy Schuize rule, higher the coagulating power of an ion, smaller the flocculating value. \[A{{l}^{3+}}>M{{g}^{2+}},C{{a}^{2+}}>N{{a}^{+}}\]
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