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Four statements about… (Class 10 Science SQP 2025-26, Q18)

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ScienceCBSE Class 10 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2025-26: question 18

From the official CBSE sample question paper for 2025-26, section B, question 18, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q18 · 1 mark · MCQAcids, Bases and Salts

Four statements about the reactions of oxides with dilute hydrochloric acid and aqueous sodium hydroxide are listed.
I. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide.
II. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium hydroxide.
III. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide.
IV. Sulphur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide.
Which statements are correct?

  1. (A)I and II
  2. (B)I and III
  3. (C)II and IV
  4. (D)III and IV

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

Which metal oxides are amphoteric?

Hint 2

An acidic oxide reacts with a base; a basic oxide reacts with an acid.

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. AlO and ZnO are amphoteric oxides, so they react with both acids and bases. Statements I and III are correct.

  2. CaO is a basic oxide and does not react with NaOH, so II is wrong. SO is an acidic oxide and reacts with NaOH, so IV is wrong. Answer: (B) I and III.

    1 mark

Answer: Option (B): I and III

Where the marks are

  • Recognises Al₂O₃ and ZnO as amphoteric and rejects II and IV, option (B) (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 paperSample paper 2025-26: 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.