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The s-Block Elements
Question
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Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy? 

  • CaSO4

  • BeSO4

  • BaSO4

  • SrSO4

Answer

B.

BeSO4

Hydration energy varies inversely with the size and in sulphates of alkaline earth metals lattice energy remains almost constant.
The order of size of alkaline earth metal is
Be2+ > Ca2+ > Sr2+ > Ba2+
Hence, BaSO4 has the hydration enthalpy higher than the lattice enthalpy.

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