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Question

Which of the following ions has the largest heat of hydration?

A
Na+
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B
Al3+
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C
F
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D
Sr2+
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Solution

The correct option is B Al3+
Hydration energy depends upon size of cation and charge of cation so higher the charge of cation and lower the size of cation have higher hydration energy.
So, here Al+3 will have highest hydration due to smaller size and charge.

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