The lattice enthalpy and hydration enthalpy of four compounds are given below : {:("Compuounds","Lattice enthalpy ( in "kJ mol^(-1)")","Hydration enthalpy ( in kJ " mol^(-1)")"),(P,+780,-920),(Q,+1012,-812),(R,+828,-878),(S,+632,-600):} The pair of compunds which is soluble in water is

The lattice enthalpy and hydration enthalpy of four compounds are give

1.	The lattice enthalpy and hydration enthalpy of four compounds are given below : {:("Compuounds","Lattice enthalpy ( in "kJ mol^(-1)")","Hydration enthalpy ( in kJ " mol^(-1)")"),(P,+780,-920),(Q,+1012,-812),(R,+828,-878),(S,+632,-600):} The pair of compunds which is soluble in water is
Answer» P and Q Q and R R and S P and R SOLUTION :A compound is soluble if hydration ENTHALPY `GT` lattice enthalpy