Science
Oxides of aluminium and zinc are:
options
- Acidic
- Basic
- Amphoteric
- Neutral
Metals & Non-Metals
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Answer
Amphoteric
Reason —
- When oxides of aluminium and zinc react with acids like HCl, they behave as bases and form salts such as aluminium chloride or zinc chloride.
Al2O3 + 6HCl → 2AlCl3 + 3H2O
ZnO + 2HCl → ZnCl2 + H2O
- When oxides of aluminium and zinc react with alkalis like NaOH, they behave as acids and form complex salts such as sodium aluminate or sodium zincate.
Al2O3 + 2NaOH → 2NaAlO2 + H2O
ZnO + 2NaOH → Na2ZnO2 + H2O
Because oxides of aluminium and zinc react with both acids and bases, these oxides are classified as amphoteric oxides.
Hence, Aluminium oxide (Al2O3) and zinc oxide (ZnO) both show amphoteric behaviour.
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