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Chemistry

Which of the following oxides produces salt upon reacting with sodium hydroxide?

  1. Na₂O
  2. CaO
  3. NO
  4. ZnO

Chemical Reaction

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Answer

ZnO

Reason — Zinc oxide (ZnO) is an amphoteric oxide, meaning it can react both as an acid and as a base. When it reacts with sodium hydroxide (NaOH), a salt (zincate) is formed along with water, which makes it an acid-base reaction.

ZnO(s) + 2NaOH(aq) → Na2​ZnO2​(aq) + H2​O(l)

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