Sodium sulphate is soluble in water but barium sulphate is sparingly soluble because :

The hydration energy of

N a_{2} S O_{4}

is more than its lattice energy

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The lattice energy of

B a S O_{4}

is more than its hydration energy

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The lattice energy has no role to play in solubility

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The lattice energy of

N a_{2} S O_{4}

is more than its hydration energy

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Solution

The correct options are
A The hydration energy of $N a_{2} S O_{4}$ is more than its lattice energy
B The lattice energy of $B a S O_{4}$ is more than its hydration energy
Concept:For any solution to become soluble in water hydration energy of the solution should me more than its lattice energy.
Here the hydration energy of sodium sulphate is more than lattice energy but in case of barium sulphate latice energy of barium sulphate is more than its hydration energy.
Hence options A & B are correct.

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