Sodium sulphate is soluble in water where as barium sulphate is sparingly soluble because :

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The hydration energy of sodium sulphate is less than its lattice energy.

The lattice energy has no role to play in solubility

The lattice energy of barium sulphate is more than its hydration energy

The hydration energy of sodium sulphate is more than its lattice energy

answer is A, B.

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Detailed Solution

$B a S O_{4}$ 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 $N a_{2} S O_{4}$ the hydration energy is more than its lattice energy, These ions are separated from each other

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