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Answer the following. (Science 2026 31/1/1 Q25)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 25

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section B, question 25, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q25 · 2 marks · Very short answerAcids, Bases and Salts

Answer the following.

  1. (a)

    What are amphoteric oxides?

    1 mark
  2. (b)

    Categorise the following based on their nature: ZnO, Na2O, CO2

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

'Amphi' means both.

Hint 2

Metal oxides are generally basic and non-metal oxides acidic. One metal oxide here behaves both ways.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) Amphoteric oxides are metal oxides that react with both acids and bases to give salt and water. Examples are and .

    1 mark

  2. (b) is an amphoteric oxide, is a basic oxide (metal oxide), and is an acidic oxide (non-metal oxide).

    1 mark

Answer: (a) Metal oxides reacting with both acids and bases to form salt and water; (b) ZnO amphoteric, Na₂O basic, CO₂ acidic

Where the marks are

  • Correct definition of amphoteric oxide (1 mark)
  • All three oxides classified correctly (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Acids, Bases and Salts, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.