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

L i^{+} > N a^{+} > K^{+} > C s^{+} > R b^{+}

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N a^{+} > L i^{+} > K^{+} > R b^{+} > C s^{+}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

N a^{+} > L i^{+} > K^{+} > C s^{+} > R b^{+}

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L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}

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Solution

The correct option is D $L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$
Hydration enthalpy depends upon the ionic potential (charge/size). As the ionic potential increases, hydration energy increases.

$△ H^{o} \propto \frac{q}{r}$

Hence the correct order is: $L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$

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Similar questions

The correct order of reactivity of alkalimetals towards $H_{2}$ is

The order of decreasing ionisation enthalpy in alkali metals is
(a) Na> Li > K> Rb (b) Rb< Na< K< Li
(c) Li > Na> K> Rb (d) K< Li < Na < Rb

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

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