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NEET2010Chemistrys Block ElementsActual

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

Options

  1. ACaSO ₄
  2. BBeSO ₄
  3. CBaSO ₄
  4. DSrSO ₄

Correct answer

B. BeSO ₄

Step-by-step solution

Key Idea Hydration energy varies inversely with size and in sulphates of alkaline earth metals lattice energy remains almost constant. The order of size of alkaline earth metals is Be ²⁺ Ca ²⁺> Sr ²⁺> Ba ²⁺ Hence, BeSO ₄ has the hydration enthalpy higher than the lattice enthalpy.

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