JEE Main Chemistry question
The lattice enthalpy and hydration enthalpy of four compounds are given below.
| Compound | Lattice enthalpy (kJ mol⁻¹) | Hydration enthalpy (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: (D)
Solution
A salt dissolves in water when the (negative) hydration enthalpy released is large enough in magnitude to overcome the (positive) lattice enthalpy that must be supplied to break the crystal apart, i.e.,
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