Assertion : `BeSO_4` and `MgSO_4` are insoluble in water.
Reason : `Be^(2+)` and `Mg^(2+)` have low hydration enthalpies.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

D

Explanation

The greater hydration enthalpies of `Be^(2+)` and `Mg^(2+)` ions overcome the lattice enthalpy factor and therefore, their sulphates are soluble in water.