The element having maximum hydration energy is:

N a

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K

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R b

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C s

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Solution

The correct option is A $N a$
Smaller the size of atom or ion, greater will be hydration and hydration energy.
$∴$ $N a$ has smallest size and greatest hydration energy among given choices.

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The correct order of reactivity of alkalimetals towards $H_{2}$ is

L i^{+}

N a^{+}

C s^{+}

K, C a, R b

C s

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