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Solubility of sulphates of second group elements decreases down the group. This fact is best explained by

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Down the group, lattice enthalpy decreases but hydration enthlpy increases

Down the group, lattice enthalpy almost remains constant but hydration enthalpy decreases

Down the group, lattice enthalpy increases but hydration enthalpy almost remains constant

Down the group, both lattice enthalpy and hydration enthalpy decreases but decrease in hydration enthalpy is more than lattice enthalpy.

answer is B.

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Detailed Solution

For very large anions like sulphates and carbonates with $M^{+ 2}$ ions(2nd group) lattice enthalpy almost remains constant in all the metal sulphates but hydration enthalpy decreases down the group. Thus solubility decreases down the group.

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