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Question

Sodium sulphate is soluble in water whereas Barium sulphate is sparingly soluble because :

A
The hydration energy of sodium sulphate is less than its lattice energy
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B
The lattice energy of Barium sulphate is more than its hydration energy
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C
The lattice energy has no role to play in solubility
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D
None of these
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Solution

The correct option is B The lattice energy of Barium sulphate is more than its hydration energy
BaSO4 is sparingly soluble in water because its hydration energy is lesser than the lattice energy and thus ions are not separated from each other. On the contrary in Na2SO4, the hydration energy is more than its lattice energy. Thus ions are separated from each other and pass in solution state.

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