Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
CaSO4
BaSO4
BeSO4
SrSO4
A
SrSO4
B
CaSO4
C
BeSO4
D
BaSO4
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Solution
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Beryllium sulphate BeSO4 has its hydration enthalpy greater than its lattice enthalpy. Hence, it is highly soluble in water.
On moving down the group, the solubility of alkaline earth metal sulphates decreases. Thus, barium sulphate and radium sulphate are practically insoluble.
Hence, option B is correct.
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