The correct order of increasing thermal stabilities of alkaline earth metal sulphates is:

S r S O_{4} < C a S O_{4} < M g S O_{4} < B e S O_{4}

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B e S O_{4} < M g S O_{4} < C a S O_{4} < S r S O_{4}

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C a S O_{4} < B e S O_{4} < M g S O_{4} < S r S O_{4}

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M g S O_{4} < B e S O_{4} < C a S O_{4} < S r S O_{4}

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Solution

The correct option is B $B e S O_{4} < M g S O_{4} < C a S O_{4} < S r S O_{4}$
The thermal stability of the sulphates of alkaline earth metals increase in the following order.
$B e S O_{4} < M g S O_{4} < C a S O_{4} < S r S O_{4}$
With increase in the atomic size the lattice energy increases as large size cation forms efficient close packing with large sulfate ion. Hence, the thermal stability increases.

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