From which of the following is the hydration | vedclass

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(A) The hydration energy of an ion is directly proportional to its charge density,which is defined as the ratio of charge to size $(q/r)$.For the give

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$Na^{+}$

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(A) The hydration energy of an ion is directly proportional to its charge density,which is defined as the ratio of charge to size $(q/r)$.For the given ions,the hydration energy increases as the charge increases and the ionic radius decreases.Comparing the ions: $Na^{+}$ ($+1$ charge),$Mg^{2+}$ ($+2$ charge),$Be^{2+}$ ($+2$ charge,smaller radius than $Mg^{2+}$),$Al^{3+}$ ($+3$ charge),and $Cr^{3+}$ ($+3$ charge).Since $Na^{+}$ has a lower charge $(+1)$ than $Mg^{2+}$ $(+2)$ and a larger ionic radius,the hydration energy of $Mg^{2+}$ is larger than that of $Na^{+}$.

From which of the following is the hydration energy of $Mg^{2+}$ larger?

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