The lattice enthalpy and hydration enthalpy of four compounds are given below Compound 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 compounds which is soluble in water is

Question

The lattice enthalpy and hydration enthalpy of four compounds are given below Compound 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 compounds which is soluble in water is (A) P and Q (B) Q and R (C) R and S (D) Q and S

Tardigrade Admin · Accepted Answer

The solubility of a compound mainly depends upon its hydration energy. If die hydration energy of a compound is greater than from its lattice enthalpy, then it is soluble in water.
Thus for solubility hydration enthalpy > lattice enthalpy For compounds P and R hydration enthalpy exceeds the lattice enthalpy, so they are soluble in water.

Q. The lattice enthalpy and hydration enthalpy of four compounds are given below Compound 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 compounds which is soluble in water is

P and Q

Q and R

R and S

Q and S

P and R

Q. The lattice enthalpy and hydration enthalpy of four compounds are given below

Compound 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 compounds which is soluble in water is