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Which of the following has highest hydration energy?

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Which of the following has highest hydration energy? 

(a) MgCl2

(b) CaCl2

(c) BaCl2

(d) SrCl2

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Correct option (a) MgCl2

Explanation:

Smaller sized and highly charged metal ions have higher hydration energy. In the alkaline earth metals, the hydration energy for the compact and charged ions is greater than the large sized charged ions. Therefore, order of hydration energy in this group is

Be2+>Mg2+ >Ca2+>Sr2+>Ba2+. 

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