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The correct order of hydration enthalpie...

The correct order of hydration enthalpies of alkali metal ions is:

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The correct Answer is:
C
Hydration enthalpy charge on an ion
`prop1/("sizeof an ion")` Hence, correct order of hydration enthalpy is `Li^(+)gtNa^(+)K^(+)gtRb^^(+)gtCs^(+)`
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