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Solution.
The enthalpy of hydration is the amount of energy released or absorbed when one mole of an ionic substance is dissolved in water and its ions are surrounded by water molecules. When sodium chloride is dissolved, energy in the form of heat will be released, i.e. the enthalpy of hydration is negative. When caesium chloride is dissolved, the energy in the form of heat will be absorbed, i.e. the enthalpy of hydration is positive. This is due to an increase in the size of the ions and a decrease in the hydrate shell. When sodium chloride is dissolved, the heat of dissolution is greater than the energy of the crystal lattice. When caesium chloride is dissolved, the heat of dissolution is less than the energy of the crystal lattice.
Answer:
CsCl