Choose the Best Answer · Q15
Q.Assertion : BeSO₄ is soluble in water while BaSO₄ is not
Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false
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Start your 14-day free trial to unlock the full solution →Step 1. The assertion is true: the text states directly that BeSO₄ and MgSO₄ are readily soluble in water, while solubility decreases going down to BaSO₄ (essentially insoluble).
Step 2. The reason is also true: hydration enthalpy magnitude of the M²⁺ ions falls steadily down the group (Be > Mg > Ca > Sr > Ba), while the lattice enthalpy of the sulphates stays relatively similar across the group (since the large SO₄²⁻ anion dominates the lattice geometry more than the changing cation size). …
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