Which is the correct order of hydration enthalpy of alkali metals?

1.	Which is the correct order of hydration enthalpy of alkali metals?
Answer» `Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)` `Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+) gt Li^(+)` `Cs^(+) gt Rb^(+) gt K^(+) gt Li^(+) gt Na^(+)` `Na^(+) gt Li^(+) gt K^(+) gt Rb^(+)gt Cs^(+) ` Solution : The hydration enthalpy of alkali metal ions decreases with increase in their ionic sizes `Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)` The degree of hydration of `Li^(+)` is the HIGHEST, DUE to which LITHIUM salts are MAINLY hydrated, e.g. LiCl, `H_(2)O`

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