33. Oxides:
The compounds of oxygen and other elements are called oxides. Types of oxides:
a. Acidic oxides: Non- metallic oxides are usually acidic in nature.
SO2 + H2O → H2SO3( sulphurous acid)
b. Basic oxides: Metallic oxides are mostly basic in nature. Basic oxides dissolve in water forming bases e. g.,
Na2O + H2O
K2O + H2O
→ 2NaOH
→ 2KOH
CaO + H2O → Ca( OH) 2
c. Amphoteric oxides: They show characteristics of both acidic as well as basic oxides.
Al2O3 + 6HCl( aq)
→ 2 AlCl3( aq) + 3H2O
Al2O3 + 6NaOH( aq) + 3H2O( l) → 2Na3 [ Al( OH) 6 ]( aq)
d. Neutral oxides: These oxides are neither acidic nor basic. Example: Co, NO and N2O