Q.

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

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a

Down the group, lattice enthalpy decreases but hydration enthlpy increases

b

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

c

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

d

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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