The lattice enthalpy and hydration enthalpy of four compounds are given below: array ccc…
Chemistry · JEE Main · NTA Exams — Chemical Thermodynamics
The lattice enthalpy and hydration enthalpy of four compounds are given below:
\[\begin{array}{ccc} \text { Compound } & \begin{array}{c} \text { Lattice enthalpy } \\ (\mathbf{k J} / \mathbf{m o l}) \end{array} & \begin{array}{c} \text { Hydration enthalpy } \\ (\mathbf{k J} / \mathbf{m o l}) \end{array} \\ \mathrm{P} & +780 & -920 \\ \mathrm{Q} & +1012 & -812 \\ \mathrm{R} & +828 & -878 \\ \mathrm{~S} & +632 & -600 \end{array}\]
The pair of compounds which is soluble in water is
\[\begin{array}{ccc} \text { Compound } & \begin{array}{c} \text { Lattice enthalpy } \\ (\mathbf{k J} / \mathbf{m o l}) \end{array} & \begin{array}{c} \text { Hydration enthalpy } \\ (\mathbf{k J} / \mathbf{m o l}) \end{array} \\ \mathrm{P} & +780 & -920 \\ \mathrm{Q} & +1012 & -812 \\ \mathrm{R} & +828 & -878 \\ \mathrm{~S} & +632 & -600 \end{array}\]
The pair of compounds which is soluble in water is
- P and Q
- Q and R
- R and S
- P and R
Answer
(D) P and R
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