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  4. The hydration energy of Mg2+ is larger than that of

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Q. The hydration energy of $Mg^{2+}$ is larger than that of

IIT JEEIIT JEE 1984Classification of Elements and Periodicity in Properties

Solution:

Hydration energy depends on charge of ion and ionic radius. Higher the charge, greater the hydration energy. On the other hand, smaller the size, greater the hydration energy. Charge is considered first for comparison. Hence, $Mg^{2+}$ has higher hydration energy than $Na^+$.