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Question:

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

Li^+ >Na^+ > K^+ > Rb^+ > Cs^+

Li^+ >Na^+ > K^+ > Cs^+ > Rb^+

Na^+ >Li^+ > K^+ > Rb^+ > Cs^+

Na^+ >Li^+ > K^+ > Cs^+ > Rb^+

Solution:

Correct option is A. Li^+ >Na^+ > K^+ > Rb^+ > Cs^+
Solution:- (A) Li^+ >Na^+ > K^+ > Rb^+ > Cs^+
Hydration enthalpy depends upon ionic potential (charge/ size). As ionic potential increases hydration enthalpy increases.