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JEE Main202330 Jan 2023Morning ShiftChemistrys Block ElementsActual

The alkaline earth metal sulphate(s) which are readily soluble in water is/are: (A) BeSO 4 (B) MgSO 4 (C) CaSO 4 (D) SrSO 4 (E) BaSO 4 Choose the correct answer from the options given below:

Options

  1. AA only
  2. BB only
  3. CA and B
  4. DB and C

Correct answer

C. A and B

Step-by-step solution

The solubility of any substance depends on the following two factors: Lattice enthalpy Hydration enthalpy The magnitude of lattice enthalpy of the alkaline earth’s metal sulphates remains almost constant as we move down the group. This is because sulphate ions are so big and the small increase in the size of cations on moving down the group doesn’t make any difference in the lattice enthalpy of the alkaline earth’s metal sulphates. However, the hydration enthalpy decreases from Be 2+ to Ba 2+ sign

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