(a) What are amphoteric oxides ? Choose the amphoteric oxides from amongst the following oxides :Na_2O, ZnO, Al_2O_3, CO_2, H_2O(b) Why is it non-metals do not displace hydrogen from dilute acids ?

(a) What are amphoteric oxides ? Choose the amphoteric oxides from amo

1.	(a) What are amphoteric oxides ? Choose the amphoteric oxides from amongst the following oxides :Na_2O, ZnO, Al_2O_3, CO_2, H_2O(b) Why is it non-metals do not displace hydrogen from dilute acids ?
Answer» SOLUTION : (a) Metal OXIDES which react both with acids and bases to form salt and water are known asamphoteric oxides. Out of the GIVEN list, ZNO and `Al_2O_3` are amphoteric oxides. (b) Elements which lie higher than HYDROGEN in the activity series are capable of displacing hydrogenfrom dilute acids. Non-metals lie below hydrogen in the activity series. Therefore, they do notdisplace hydrogen from dilute acids.