Which oxide is alkaline?

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(B) The acidic or alkaline nature of oxides of Group $15$ and Group $13$ elements depends on their metallic character.As we move down a group,the meta

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$Bi_2O_3$

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(B) The acidic or alkaline nature of oxides of Group $15$ and Group $13$ elements depends on their metallic character.As we move down a group,the metallic character increases,which leads to an increase in the basic (alkaline) nature of the oxides.$P_2O_3$,$As_2O_3$,and $B_2O_3$ are acidic in nature.$Bi_2O_3$ is basic (alkaline) in nature due to the high metallic character of Bismuth $(Bi)$.

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