Question

ance equation of An amphoteric oxide
reacts with acid as well as base to form salt
and water.


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Answer 1

• Amphoteric oxide: Metal oxides which react with both acids and bases to form salt and water. (Neutralization reaction)
• Aluminium oxide and Zinc oxide are examples of amphoteric oxides.

Reaction of Amphoteric oxides with acids:

• 1. Al₂O₃ + HCl → AlCl₃ + H₂O

⚛ Balanced equation:

• Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

• 2. Al₂O₃ + H₂SO → Al₂(SO₄)₃ + H₂O

⚛ Balanced equation:

• Al₂O₃ + 3H₂SO → Al₂(SO₄)₃ + 3H₂O

Reaction of Amphoteric oxides with bases:

• 1. ZnO  + NaOH → Na₂ZnO₂ + H₂O

⚛ Balanced equation:

• ZnO  + 2NaOH → Na₂ZnO₂ + H₂O

• 2. Al₂O₃ + NaOH → NaAlO₂ + H2O

⚛ Balanced equation:

• Al₂O₃ + 2NaOH → NaAlO₂ + H2O