In the following reactions, $Z n O$ is respectively acting as a/an:
(a) $Z n O + {N a}_{2} O ⟶ {N a}_{2} Z n O_{2}$
(b) $Z n O + C O_{2} ⟶ Z n C O_{3}$

acid and acid

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acid and base

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base and acid

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base and base

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Solution

The correct option is B acid and base
ZnO is a famous amphoteric oxide. An amphoteric oxide is a compound which can act as acid in presence of base and as base in presence of acidic compound.
(a) ZnO is acting as acid, as Na2O is basic in nature.
(b) ZnO is acting as base, as CO2 is slightly acidic in nature.
option (B) is correct.

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Z n O + C O_{2} \to Z n C O_{3}

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Z n O + C O_{2} \to Z n C O_{3}

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Z n C O_{3} ⟶ Z n O + C O_{2}

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