Teaching DSSSB TGT Mock Test 2025 General Science Chemistry Classification of Elements and Periodicity in Properties
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
1
CuO and ZnO
2
Al2O3 and ZnO
3
Al2O3 and CuO
4
More than one of the above