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