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NEET levelSingle correct optionDifficulty 1 of 3pt215

Which of the following oxides is the most basic?

A $BeO$
B $MgO$
C $CaO$
D $BaO$

Answer: D

Down group 2 the metals become more electropositive (electronegativity falls), so the metal-oxygen bond becomes more ionic and the oxide more basic.

BaO

is the most basic and

BeO

, which is amphoteric, the least.

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