(A) $P_2O_5$ and $As_2O_3$ are acidic oxides,$Sb_2O_3$ is amphoteric,while $Bi_2O_3$ is a basic oxide. $P_2O_5$ is the most acidic among them all. Thi

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(A) $P_2O_5$ and $As_2O_3$ are acidic oxides,$Sb_2O_3$ is amphoteric,while $Bi_2O_3$ is a basic oxide. $P_2O_5$ is the most acidic among them all. This is because down the group,metallic character increases and non-metallic character decreases,which leads to an increase in the basicity of oxides and a decrease in acidity.