UPSEE 2018 Solved Paper

B2O3 is the acidic oxide. On moving down the group 13, the nature of oxide changes from acidic to basic.

B2O3

Acidic

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{Al2O3 and Ga2O3}

Amphoteric

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{In2O3‌and‌Tl2‌O3}

Basic

Acidic character of boron oxide may be explained on the basis of small size of boron. Due to small size there is high positive charge density on atom.