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Science · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q25
(a) What are amphoteric oxides? (b) Categorise the following based on their nature: ZnO, Na_2 O, CO_2
(a)
What are amphoteric oxides ?
(b)
Categorise the following based on their nature : $\displaystyle \mathrm{ZnO}, \mathrm{Na}_{2} \mathrm{O}, \mathrm{CO}_{2}$
Marking-scheme solution
(a) Metal oxides which can react with both acids as well as bases to produce salt and water.
(b) ZnO - Amphoteric oxide \(\displaystyle \mathrm{Na}_{2} \mathrm{O}\) - Basic oxide \(\displaystyle \mathrm{CO}_{2}\) - Acidic oxide
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.