Q.

Na2SO4 is soluble in water white BaSO4 is insoluble. Which of the reason is correct about the above statement.

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a

Lattice energy of BaSO4 exceeds its hydration energy

b

Hydration energy of BaSO4 exceeds its lattice energy.

c

The solubility in H2O of a compound depends only on its hydration energy.

d

The solubility in H2O of a compound depends only on its lattice energy.

answer is A.

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Detailed Solution

For ionic compound if lattice energy ΔuH⊙> hydration   energy ΔhydH⊖ the compound is insoluble and vice versa. Na2SO4,ΔuH⊖<Δhyd H⊖, thus it is soluble in H2O. For BaSO4,ΔuH⊖>Δhyd H⊖, thus it is insoluble in H2O.
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