Question

Which one among the following is the most acidic?

• A. $N_2{O}_3$
• B. $P_2{O}_3$
• C. $A{s}_2{O}_3$
• D. $S{b}_2{O}_3$

Answer 1

The correct option is A $N_2{O}_3$

As we move down the group, acidity decreases because atomic size increases and electronegativity decreases.
So acidity order will be:
$N_2{O}_3>P_2{O}_3>A{s}_2{O}_3>S{b}_2{O}_3$