Which one of the following alkaline earth  metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?

  • Option 1)

      CaSO4   
     

     

  • Option 2)

     BeSO  
     

  • Option 3)

    BaSO  
     

  • Option 4)

     SrSO4   

 

Answers (1)

As we learnt in

Solubility of sulphates of alkaline metals -

Solubility in water decreases from Be to Ba

- wherein

Lattice energy is constant whereas hydration energy decreases from Be^{2}^{+}\ to\ Ba^{2}^{+}

 

Solubility of sulphate in water decreases from Be\:to\:Ba

Solubility order

 \Rightarrow BeSO_{4}> MgSO_{4}> CaSO_{4}> SrSO_{4}> BaSO_{4}


Option 1)

  CaSO4   
 

 

This option is incorrect.

Option 2)

 BeSO  
 

This option is correct.

Option 3)

BaSO  
 

This option is incorrect.

Option 4)

 SrSO4   

This option is incorrect.

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