The correct order of the solubility of alkaline-earth metal sulphates in water is:

M g < S r < C a < B a

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M g < C a < B a < S r

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M g > S r > C a > B a

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M g > C a > S r > B a

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Solution

The correct option is D $M g > C a > S r > B a$
The correct order of the solubility of alkaline-earth metal sulphates in water is $M g > C a > S r > B a .$
With an increase in the atomic number, the solubility of alkaline earth metal sulphate in water decreases.
The decrease in hydration energy (on moving down the group) is much more than the decrease in the lattice energy.

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