Answer:
Lattice energies of the sulphates are
nearly the same. The size of sulphate ion is large and small changes in cation size
do not affect the lattice energies. However, the hydration energies decrease
from \[B{{e}^{2+}}\] to\[B{{a}^{2+}}\].
Hence, solubility of sulphates decreases from top to bottom.
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