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(a) What are amphoteric oxides ? Choose ...

(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 ?

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(a) Metal oxides which react both with acids and bases to form salt and water are known as amphoteric 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 hydrogen from dilute acids. Non-metals lie below hydrogen in the activity series. Therefore, they do not displace hydrogen from dilute acids.
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