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

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

(a) decreasing hydration energy

(b) high ionisation energy

(c) increase in melting Point

(d) all of these

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Correct option  (a) decreasing hydration energy

Explanation:

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

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