Q.

Na2SO4 is soluble in water whereas BaSO4 is sparingly soluble because

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a

The lattice enthalpy of Na2SO4 is less than its hydration enthalpy.

b

Sodium is monovalent ion whereas barium is a divalent ion.

c

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

d

The lattice enthalpy of barium sulphate is less than its hydration enthalpy

answer is A.

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Detailed Solution

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.
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