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Correct statement(s) among the following...

Correct statement(s) among the following is/are :

A

From saturated aq solution, `BaCO_(3)` and `BaSO_(4)` precipates without any water of crystallisaton.

B

The hydrated chlorides, bromides and iodides of Ca, Sr, Ba can be dehydrated on heating but those of Be and Mg hydrolysis if heated.

C

Among the fluorides of IIAl, `BeF_(2)` is readily soluble in water.

D

`BeCO_(3)` can be precipitated completely by addition of sodium carbonate to `Be^(2+)` aq solution.

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