Question

13. Assertion: Al2O3 is an amphoteric oxide.
Reason: Al2O3 reacts with acid as well as base to form salt & water.​

Answer 1

Assertion and reason both are true and reason is the correct explanation for assertion.

Explanation:

• Amphoteric oxides are oxides which behave as both basic and acidic oxides.
• Amphoteric Oxides contain the features of acidic and basic oxides as well that neutralize both acids and bases.

• Depending upon reactants and other reaction conditions, the compound behaves either like acid or as a base.

• Generally non-metallic oxides are acidic and metallic oxides are basic. Some non-metallic oxides are neutral and some metallic or semi metallic oxides are amphoteric.

• Oxides are compounds of metals or non-metals with oxygen. There are four types of oxide.
• Amphoteric oxides are classified as metal oxides that react with both acids as well as bases to create salts and water.

• Amphoteric oxides undergo a neutralisation reaction to form water and salt as they react with acid.

$Al_{2} O_{3} +2NaOH$ → $2NaAlO_{2}+H_{2} O$

$Al_{2} O_{3} +6HCl$ → $2AlCl_{3}+3H_{2} O$

$Al_{2} O_{3}$ reacts with base or acid to give salt and water.