Which of the following will have highest hydration energy?

L i^{+}

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N a^{+}

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B e^{+ +}

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M g^{+ +}

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Solution

The correct option is C $B e^{+ +}$
$B e^{2 +}$ ion has small size and high charge. Hence, it has high polarizing power and can attract several water molecules. Thus it has highest hydration energy among the given ions.

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The hydration energy of $M g^{2 +}$ is larger than that of:

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The hydration energy of $M g^{2 +}$ is greater than that of

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