The correct order of hydration enthalpies of alkali metal ions is
- A$Li ^{+} > Na ^{+} > K ^{+} > Cs ^{+} > Rb ^{+}$
- B$Na ^{+} > Li ^{+} > K ^{+} > Rb ^{+} > Cs ^{+}$
- C$Na ^{+} > Li ^{+} > K ^{+} > Cs ^{+} > Rb ^{+}$
- D$Li ^{+} > Na ^{+} > K ^{+} > Rb ^{+} > Cs ^{+}$
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