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Chemistry
The correct order of hydration enthalpies of alkali metal ions is -
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Q. The correct order of hydration enthalpies of alkali metal ions is -
JEE Main
JEE Main 2019
The s-Block Elements
A
$ Li^{+} > Na^{+} > K^{+} > Rb^{+} > Cs^{+} $
57%
B
$ Li^{+} > Na^{+} > K^{+} > Cs^{+} > Rb^{+} $
11%
C
$ Na^{+} >Li^{+} > K^{+} > Rb^{+} > Cs^{+} $
6%
D
$ Na^{+} > Li^{+} >K^{+} > Cs^{+} > Rb^{+} $
26%
Solution:
Hydration enthalpy depends upon ionic potential (charge / size). As ionic potential increases hydration enthalpy increases.