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In the reactions below, identify the nature of ZnO in (a) and (b) respectively: (a) ZnO + Na2O -> Na2ZnO2 (b) ZnO + CO2 -> ZnCO3

1. base and acid
2. base and base
3. acid and acid
4. acid and base

Correct answer: acid and base

Solution

ZnO is amphoteric. Reacting with the basic Na2O it acts as an acidic oxide (forming zincate), while reacting with the acidic CO2 it acts as a basic oxide (forming carbonate).

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