Dissolution of a solute is an exothermic process, if:

hydration energy

>

lattice energy

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hydration energy

<

lattice energy

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hydration energy

=

lattice energy

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none of the above

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Solution

The correct option is A hydration energy $>$ lattice energy
The dissolution of a solute is an exothermic process if hydration energy $>$ lattice energy. The hydration step in the second step is always exothermic (hydration $<$ 0), as water molecules are attracted to the electrostatic field of the ion. Favourable conditions for solution formation typically involve a negative value of $H_{s o l u t i o n}$ ; this arises because the hydration process exceeds the lattice energy in the solute.
$Δ H_{s o l u t i o n} = Δ H_{h y d r a t i o n} + Δ H_{lattice energy}$
$Δ H_{h y d r a t i o n} = - v e$
$Δ H_{l a t t i c e e n e r g y} = + v e$

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Hydration energy ${Δ H}_{h y d r a} . (k J m o l^{- 1})$	Lattice energy $Δ H_{u} (k J m o l^{- 1})$
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N H_{4} C l

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