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Q.

The dissociation for NaCl into its ions requires the energy called ...(i)... but in the hydration of Na+ and Cl– ions energy is released called ....(ii).... There is the ...(iii)... of energy in the overall process. Fill the blanks with an appropriate word. 

 (i)(ii)(iii)
1)lattice energyhydration energyrelease
2)hydration energylattice energyrelease
3)lattice energyhydration energyabsorbtion
4)hydration energylattice energyabsorbtion

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a

1

b

2

c

3

d

4

answer is C.

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Detailed Solution

Any ionic compound is soluble when 

(1) oppositely charged ions are seperated. Energy required to dissociate crystal lattice into oppositely charged ions is known as lattice energy. It is endothermic

(2) oppositely charged ions are solvated by water molecules and energy is released known as hydration enthalpy. It is exothermic

For NaCl endothermicity is greater than exothermicity and slightly energy is absorbed

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