Which oxide is acidic in nature?
Oxides of non-metals (right side of periodic table) are acidic. SO₃ (group 16) is acidic, while Na₂O (group 1), MgO (group 2), and Al₂O₃ (group 13, amphoteric) are not purely acidic.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
