A) \[N{{a}^{+}}\]
B) \[M{{g}^{+2}}\]
C) \[C{{a}^{+2}}\]
D) \[A{{l}^{+3}}\]
Correct Answer: D
Solution :
\[C{{a}^{+2}}>\ N{{a}^{+}}\ >\ M{{g}^{+2}}\ >\ A{{l}^{+3}}\]
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