The correct order of hydration enthalpies of alkali metal ions is - Vidyadip

MCQ

The correct order of hydration enthalpies of alkali metal ions is

A
$Li^+ > Na^+ > K^+ > Cs^+ > Rb^+$
B
$Na^+> Li^+ > K^+ > Rb^+ > Cs^+$
C
$Na^+ > Li^+ > K^+ > Cs^+ > Rb^+$
✓
$Li^+ > Na^+ > K^+ > Rb^+ > Cs^+$

✓

Answer

Correct option: D.

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

d
Hydration enthalpy depends upon ionic potential (charge/size). As ionic potential increases hydration enthalpy increases

${\Delta _{hyd}}{H^o} \propto \frac{q}{r}$

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