Question

What are amphoteric oxides? Give two examples.

Hint:

Common amphoteric oxides include {Aluminium oxide (Al\(_2\)O\(_3\))} and {Zinc oxide (ZnO)}.

Answer 1

Concept: Oxides are compounds formed when elements react with oxygen. Based on their chemical behavior, oxides can be classified as acidic, basic, and amphoteric oxides.
Step 1:Definition of Amphoteric Oxides Amphoteric oxides are those oxides that show both acidic and basic properties. They react with both acids and bases to form salt and water.
Step 2:Examples of Amphoteric Oxides

• Aluminium oxide \((Al_2O_3)\)
• Zinc oxide \((ZnO)\)

Example Reactions: Reaction with acid: \[ Al_2O_3 + 6HCl \rightarrow 2AlCl_3 + 3H_2O \] Reaction with base: \[ Al_2O_3 + 2NaOH \rightarrow 2NaAlO_2 + H_2O \] These reactions show that amphoteric oxides can react with both acids and bases.