Question

Among $Al_{2}O_{3},SiO_{2},P_{2}O_{3}$ and $SO_{2}$ the correct order of acid strength is

• A. $Al_{2}O_{3} < SiO_{2} < SO_{2} < P_{2}O_{3}$
• B. $Al_{2}O_{3} < SiO_{2} < P_{2}O_{3} < SO_{2}$
• C. $SiO_{2} < SO_{2} < Al_{2}O_{3} < P_{2}O_{3}$
• D. $SO_{2} < P_{2}O_{3} < SiO_{2} < Al_{2}O_{3}$

Answer 1

Answer: (B)

While moving along a group from top to bottom, acidic nature of oxides decreases and along a period left to right, acidic nature increases.



So, $Al_{2}O_{3} < SiO_{2} < P_{2}O_{3} < SO_{2}$