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For the following reactions ZnO respectively acting as a/an<br>i) $$\text{ZnO} + \text{Na}_2\text{O} \rightarrow \text{Na}_2\text{ZnO}_2$$ ii) $$\text{ZnO} + \text{CO}_2 \rightarrow \text{ZnCO}_3$$
ZnO is amphoteric. In i) it reacts with the basic oxide $$\text{Na}_2\text{O}$$ to form the zincate salt, so it acts as an acid. In ii) it reacts with the acidic oxide $$\text{CO}_2$$ to form a carbonate, so it acts as a base.
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