Some metal oxides react with acid as well as a base to produce salt and water. They are known as amphoteric oxides. Examples of amphoteric oxides are
- ACuO and ZnO
- BAl2O3 and ZnO
- CAl2O3 and CuO
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (b) Al2O3 and ZnO
Explanation
Amphoteric oxides react with both acids and bases to form salt and water.
Al2O3 and ZnO are amphoteric: Al2O3 reacts with HCl to give AlCl3, while ZnO reacts with NaOH to give sodium zincate.
CuO is a basic oxide, so any pair containing CuO is incorrect.