Why is aluminium oxide called amphoteric?
Answer and explanation
Correct answer: It reacts with both acids and bases
The governing concept is amphoteric behaviour, meaning that a substance can react with both acids and bases. Aluminium oxide reacts with an acid such as HCl to form aluminium chloride and water: Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O. It also reacts with a strong base such as NaOH to form sodium aluminate in aqueous conditions. Thus it is neither exclusively acidic nor exclusively basic, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
It reacts with both acids and bases
Why is this the correct answer?
The governing concept is amphoteric behaviour, meaning that a substance can react with both acids and bases. Aluminium oxide reacts with an acid such as HCl to form aluminium chloride and water: Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O. It also reacts with a strong base such as NaOH to form sodium aluminate in aqueous conditions. Thus it is neither exclusively acidic nor exclusively basic, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
