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Question

Sodium sulphate is solution is water whereas barium sulphate is sparingly soluble because:

A
the hydration energy of solution sulphate is more 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
the hydration energy of sodium sulphate is less than its lattice energy.
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Solution

The correct option is A the hydration energy of solution sulphate is more than its lattice energy.

  1. Option A is correct: For greater solubility, hydration energy must be greater than lattice energy.
  2. Option B is incorrect: Greater lattice energy discourage dissolution of a salt.
  3. Option C is incorrect: When a salt dissolve, energy is required to break the lattice, which comes from hydration process.
  4. Option D is incorrect: As for same reason explained in (A).


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