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

1. Li + > Na + > K + > Rb + > Cs +
2. Na + > Li + > K + > Rb + > Cs +
3. Li + > Na + > K + > Cs + > Rb +
4. Na + > Li + > K + > Cs + > Rb +

Correct answer: Li + > Na + > K + > Rb + > Cs +

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