11.26. (a) Classify following oxides as neutral, acidic, basic or amphoteric:
CO, B₂O₃, SiO₂, CO₂, Al₂O₃, PbO₂, Tl₂O₃
(b) Write suitable equations to show their nature.

(a) Neutral — CO
Acidic — B₂O₃, SiO₂, CO₂ 

Basic — Tl₂O₃ 

Amphoteric — Al₂O₃, PbO₂

(b)-CO does not react with acid as well as base at room temperature.
Being acidic B₂O₃, SiO₂ and CO₂ react with alkalis to form salts.

B₂O₃ + 2NaOH à 2NaBO₂ + H₂O

SiO₂ + NaOH à 2Na₂SiO₃ + H₂O

CO₂ + 2NaOH à Na₂CO₃ + H₂O

Being