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Asked by Sreedevi Last Modified
Answer 
use fajan’s rule in this case
as you can see the charge on cation and anion are the same so, all depends on the size of cation.
according to fajan’s rule as the size of cation increases the polarizing power decreases and covalent character decreases. Or ionic character increases. Hence basic character increases down the group.
BeO>MgO>CaO>BaO (acidic order)
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