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UPSEE 2018 Solved Paper

Question : 76 of 150

Marks: +1, -0

Which of the following oxide is of acidic nature?

$\mathrm{B}_2\mathrm{O}_3$
$\mathrm{Al}_2\mathrm{O}_3$
$\mathrm{Ga}_2\mathrm{O}_3$
$\ln_{2}\mathrm{O}_3$

Solution:

\mathrm{B}_2\mathrm{O}_3

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

\underset{\text{Acidic}}{\mathrm{B}_2\mathrm{O}_3} \; \; \underset{\text{Amphoteric}}{\{ \mathrm{Al}_2\mathrm{O}_3 \text{ and } \mathrm{Ga}_2\mathrm{O}_3 \}}

\; \; \underset{\text{Basic}}{\{ \mathrm{In}_2\mathrm{O}_3 \text{ and } \mathrm{Tl}_2\mathrm{O}_3 \}}

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.

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