A) \[N{{a}^{+}}>M{{g}^{2+}}>A{{l}^{3+}}>S{{i}^{4+}}\]
B) \[S{{i}^{4+}}<A{{l}^{3+}}>M{{g}^{2+}}>N{{a}^{+}}\]
C) \[A{{l}^{3+}}<S{{i}^{4+}}>N{{a}^{+}}>M{{g}^{2+}}\]
D) \[N{{a}^{+}}<M{{g}^{2+}}<A{{l}^{3+}}<s{{i}^{4+}}\]
Correct Answer: A
Solution :
More the positive charge over the cation the smaller will be the size. Hence, the correct option is (a).
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