Question

Which of the following oxide is the most acidic?

• A. $P_2{O}_3$
• B. $A{s}_2{O}_3$
• C. $S{b}_2{O}_3$
• D. $B{i}_2{O}_3$

Answer 1

The correct option is A $P_2{O}_3$

Down the group, the acidic nature of oxides decreases due to the increase in metallic character of the group $15$ elements.
$N_2{O}_3,P_2{O}_3\to$ Acidic
$A{s}_2{O}_3,S{b}_2{O}_3\to$ Amphoteric
$B{i}_2{O}_3\to$ Basic
hence, option (a) is the correct answer.