Question

Sodium sulphate is soluble in water, whereas barium sulphate is sparingly soluble because :

• A. the hydration energy of sodium sulphate is more than its lattice energy
• B. the lattice energy of barium sulphate is more than its hydration energy
• C. the lattice energy has no role to play in solubility
• D. the hydration energy of sodium sulphate is
  less than its lattice energy

Answer 1

Answer: (A), (B)

The correct options are
A the hydration energy of sodium sulphate is more than its lattice energy
B the lattice energy of barium sulphate is more than its hydration energy

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 lattice energy of barium sulphate is more than its hydration energy. Hence options A & B are correct.