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Q.

Decreasing order of hydration energy of the following cations is

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a

Be+2>Mg+2>Ca+>Ba+2

b

Be+2

c

Ca+

d

Be+2Ca+

answer is A.

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Detailed Solution

Hydration enthalpies of alkaline earth metal ions decreases down the group. Compounds of alkaline earth metals are more extensively hydrated then those of alkali metals.
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Decreasing order of hydration energy of the following cations is