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Question

In which following hydration energy is less than Mg2+

A
Na+
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B
Al+3
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C
Be+2
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D
Cr3+
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Solution

The correct option is B Na+
Hydration energy depends on the charge of ion and ionic radius. Higher the charge, greater the hydration energy. On the other hand, smaller the size, greater the hydration energy.
Based on this Na+ is having lower hydration energy than Mg+

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