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Home » 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.
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.
CBSE | Chemistry | Class 11 | Classification of Elements and Periodicity in Properties | NCERT Exemplar
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

Acidic oxides are oxides that react with water to produce acids.

SO2, B2O3 are acidic oxides and p block elements.

The chemical equation for the reaction of B2O3 with water:-

B2O3 +3 H2O → 2H3BO3

The chemical equation for the reaction of SO2 with water:-

SO2 + H2O → H2SO3

BASIC OXIDES

The oxides that react with water to produce bases are known as basic oxides.

Cao, BaO, Ti2O form basic oxides

The chemical equation for the reaction of CaO with water:

Cao + H2O → Ca(OH)2

The chemical equation for the reaction of Ti2O with water:

BaO + H2O → Ba(OH)2

AMPHOTERIC OXIDES

Oxides that act as both basic and acidic are known as amphoteric oxides.

Zinc oxides and aluminium oxides are the two amphoteric oxides.

The chemical equation for the reaction of ZnO with water:

ZnO + 2H2O + 2NaOH → Na3Zn[OH]4 + H2

ZnO +2HCl → ZnCl2 + H2O

The chemical equation for the 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)]3+(aq) + 6Cl-

 

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