(a) If both assertion and reason are true and reason is the true explanation of the assertion.
(b) If both assertion and reason are true but reason is not the true explanation of the assertion.
(c) If assertion is true ,but reason is false.
(d) If both assertion and reason are false.
Assertion. Na2 SO4 is soluble in water while BaSO4 is insoluble.
Reason.Lattice energy of barium sulphate exceeds its hydration enthalpy.
