Question

The hydration energy of $M{g}^{2+}$ is greater than that of :

• A. $A{1}^{3+}$
• B. $N{a}^{+}$
• C. $B{e}^{3+}$
• D. $M{g}^{3+}$

Answer 1

The correct option is B $N{a}^{+}$

$M{g}^{2+}$ has the larger hydration energy, because hydration energy increases with the charge on the cation and decreases as the size of the cation increases. Therefore answer is $N{a}^{+}$.