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

Answer»

P and Q
Q and R
R and S
P and R

Solution :A compount is SOLUBLE in water when its hydration enthalpy is GREATER than its lattice enthalpy.


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