p-Block elements form acidic, basic and amphoteric oxides. Explain each property by giving two examples and also write the reactions of these oxides with water.

ACIDIC OXIDES


SO2 , B2O3 are acidic oxides and p block elements.


Reaction of SO2 with water


SO2 + H2O → H2SO3


Reaction of B2O3 with water


B2O3 +3 H2O → 2H3BO3


Acidic oxides are those oxides that form acids after reacting with water.


BASIC OXIDES


CaO, BaO, Ti2O form basic oxides


Reaction of Ti2O with water.


BaO + H2O → Ba(OH)2


REACTION OF CaO WITH WATER


CaO + H2O → Ca(OH)2


Basic oxides are those oxides that form bases after reacting with water


AMPHOTERIC OXIDES


Zinc oxides and aluminium oxides are the two amphoteric oxides.


REACTION OF ZnO WITH WATER


ZnO + 2H2O + 2NaOH → Na3Zn[OH]4 + H2


ZnO +2HCl → ZnCl2 + H2O


REACTION OF Al2O3 WITH WATER


Al2O3 (s) + 6 NaOH(aq) + 3H2O(l) → Na3 [Al(OH)6] (aq)


Al2O3 (s) + 6HCl(aq) + 9H2O(l) → 2[Al(H2O)6]3+(aq) + 6Cl-


Those oxides that form both acids and bases are known as Amphoteric Oxides.


1