Question

Statement 1: $BeS{O}_4$ and $MgS{O}_4$ are soluble in water
Statement 2: $BaS{O}_4$ is water insoluble because lattice energy of $BaS{O}_4$ is higher than its hydration energy

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1
• B. Ifboth Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1
• C. If Statement 1 is true but Statement 2 is false
• D. If Statement 1 is false but Statement 2 is true

Answer 1

Answer: (B)

$BeS{O}_4$ and $MgS{O}_4$ are readily soluble in water; the solubility decreases from $CaS{O}_4$ to $BaS{O}_4$ The greater hydration enthalpies of $B{e}^{2+}$ and $M{g}^{2+}$ ions overcome the lattice enthalpy factor and therefore their sulphates are soluble in water