Q. 34

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.

Answer :

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.


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