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Question

Na2SO4 is water soluble but BaSO4 is insoluble because :

A
The hydration energy of Na2SO4 is higher than that of its lattice energy
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B
The hydration energy of Na2SO4 is less than that of its lattice energy
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C
The hydration energy of BaSO4 is less than that of its lattice energy
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D
The hydration energy of BaSO4 is higher than that of its lattice energy
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Solution

The correct options are
B The hydration energy of Na2SO4 is higher than that of its lattice energy
D The hydration energy of BaSO4 is less than that of its lattice 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 lattice energy of barium sulphate is more than its hydration energy.
Hence options A & C are correct.

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