Which oxide is neutral in nature?
Neutral oxides do not react with acids or bases. CO (group 14) is neutral, unlike K₂O (basic), P₂O₅ (acidic), or ZnO (amphoteric).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy