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Question

The hydration energy of Mg2+ is larger than that of

A
Al3+
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B
Na+
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C
Be2+
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D
Mg3+
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Solution

The correct option is A Na+
Hydration energy depends on ionic radii and radii decreases as we move along column from left to right and increases down the group, also as positive charge increases, radii dereases. As radii increases, hydration energy decreases. So among all given options only sodium ion has bigger radii than Mg+2 so it has lower hydration energy than Mg+2. Hydration energy of Na+=435 KJ/mol. Hydration energy of Mg+2=1921 KJ/mol.

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