The order of the increasing basicity of the compounds is as follows.

B₂O₃> Al₂O₃> Ga₂O₃> In₂O₃

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Ba₂O₃> Ga₂O₃> Al₂O₃> In₂O₃

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Ba₂O₃< Ga₂O₃< Al₂O₃< In₂O₃

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Ba₂O₃< Al₂O₃< Ga₂O₃< In₂O₃

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Solution

The correct option is D
Ba₂O₃< Al₂O₃< Ga₂O₃< In₂O₃

On moving down the group there is a gradual change from acidic to amphoteric to basic nature.

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