Question

(a) What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides: Na2O, ZnO, Al2O3, CO2, H2O (b) Why is it that non-metals do not displace hydrogen from dilute acids?

Answer 1

 (a) Metal oxides that react with both acids and bases to produce salt and water are known as amphoteric oxides. For example, zinc reacts with an acid or a base to produce salt and water. Amongst the given oxides, zinc oxide (ZnO) and aluminium oxide (Al2O3) are amphoteric oxides. (b) Non-metals are electron acceptors. Hence, they cannot donate electrons to H+ ions to form hydrogen gas (H2).

Answer 2

Answer:

amphoteric oxide - the oxide which react with both basic as well as acid to form salt and water

from above given

ZnO2 a Al2O3 are the example of amphoteric

while H2O is a neutral