The correct order of hydration enthalpies is , Choose the correct answer from the options given below: [2023]

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Solution

Q.
The correct order of hydration enthalpies is

(A) $K^{+}$ (B) ${Rb}^{+}$ (C) ${Mg}^{2 +}$ (D) ${Cs}^{+}$ (E) ${Ca}^{2 +}$

Choose the correct answer from the options given below: [2023]

1 C > E > A > B > D

2 C > E > A > D > B

3 C > A > E > B > D

4 E > C > A > B > D

Ans.
(1)

${Mg}^{2 +} > {Ca}^{2 +} > K^{+} > {Rb}^{+} > {Cs}^{+}$

Decreasing the size, hydration energy increases.

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