The right order of solubility of sulphates of alkaline earth metals in water 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 D $B e > M g > C a > S r > B a$
The solubility of sulphates in water decreases on moving down the group $B e {S O}_{4}$ and $M g {S O}_{4}$ are fairly soluble in water while $B e {S O}_{4}$ is completely insoluble. This is due to increases in lattice energy of sulphate down the group which predominates over hydration energy.

Order of solubility of sulphates: $B e {S O}_{4} > M g {S O}_{4} > C a {S O}_{4} > S r {S O}_{4} > B a {S O}_{4}$

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

B e^{2 +}

M g^{2 +},

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C a^{2 +}

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