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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
Acidity of group 15 oxides increases with oxidation state and decreases down the group. N₂O₅ (N in +5) is the most acidic, forming HNO₃, unlike P₂O₅, As₂O₅, or Sb₂O₅.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Group 15 elements form acidic oxides, especially higher oxides. P forms P₂O₅, which is acidic, unlike Be (basic), Ca (basic), or Zn (amphoteric).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Basic oxides are formed by metals, especially s-block elements. BaO (group 2) is basic, unlike N₂O₅ (acidic), SiO₂ (acidic), or Al₂O₃ (amphoteric).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
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