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Question

The hydration energy of Mg2+ is greater than that of


A

Na+

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B

Al3+

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C

Be2+

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D

All of the above

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Solution

The correct option is A

Na+


With the same charge, Be2+ has greater charge density than Mg2+. Al3+'s charge density is even higher.

The more the charge density, the greater the extent of hydration. Hence Na+ is correct.

Hydration of Mg2+ > Na+


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