Dissolution of a solute is an exothermic process, if:

Lattice Energy > Hydration Energy

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Hydration Energy = Lattice Energy

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Hydration Energy > Lattice energy

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All of the above

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Solution

The correct option is C Hydration Energy > Lattice energy
Hydration energy is the energy released when ions are dissolved in water i.e., negative in magnitude.
Lattice Energy is energy required to break the bond between the oppositely charged ions i.e., positive in magnitude.
$E n t h a l p y o f s o l u t i o n = L a t t i c e e n e r g y + H y d r a t i o n e n e r g y$
So, the dissolution of a solute is exothermic only when $H y d r a t i o n E n e r g y > L a t t i c e E n e r g y$ .

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