The right order of the solubility of sulphates alkaline earth metals is:

B e > C a > M g > B a > S r

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M g > B e > B a > C a > S r

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B e > M g > C a > S r > B a

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M g > C a > B a > B e > S r

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Solution

The correct option is C $B e > M g > C a > S r > B a$
Think of the dipositive cations as we go down the group. Clearly, the charge density decreases from $B e$ to $B a$ .
This means that the hydration enthalpy of $B e^{2 +}$ would be the highest and this hydration enthalpy will decrease as
we go down the group. On the other hand, the lattice energy doesn't show as much of a pronounced decrease.

Hence the answer.

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