• # question_answer $M{{g}^{2+}}$ ion is more highly hydrated than $N{{a}^{+}}$ ion.

Answer:

The positive charge density around $M{{g}^{2+}}$ ion is more than around $N{{a}^{+}}$ ion due to its smaller size and more number of positive charges. Therefore, $M{{g}^{2+}}$ ion has a greater tendency to attract surrounding ${{H}_{2}}O$  molecules from water than $N{{a}^{+}}$ion. In other words, it is more highly hydrated than $N{{a}^{+}}$ ion.

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