Question

The solubility in water of sulphates down the $Be$ group is $Be > Mg > Ca > Sr > Ba$. This is due to

• A. decrease in hydration energy
• B. high ionisation number
• C. increasing in melting point
• D. all of these

Answer 1

Answer: (A)

decrease in hydration energy

Answer 2

In the alkaline earth metal group the lower metals have high heat of hydration than the larger ones due to the fact heat of hydration is higher for small sized highly charged cations. So solubility of sulphate of these metals decrease down the group.