Chemistry
Which of the following oxides produces salt upon reacting with sodium hydroxide?
- Na₂O
- CaO
- NO
- 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) → Na2ZnO2(aq) + H2O(l)
Sodium oxide is a basic oxide. It does not react with sodium hydroxide. Calcium oxide is also a basic oxide. It does not react with bases. Nitric oxide is a neutral oxide. It does not react with sodium hydroxide.
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