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In the question, two… (Class 10 Science 2026, Q24)

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ScienceCBSE Class 10 · Board exam 2026, set 31/4/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2026: question 24

Set in the CBSE Class 10 board exam of 2026, paper 31/4/1, section B, question 24, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q24 · 1 mark · Assertion-reasonCompetency-basedCarbon and its Compounds

In the question, two statements are given - One labelled as Assertion (A) and other labelled as Reason (R). Write the correct answer selecting the appropriate option from (A), (B), (C) & (D) given below.

Assertion (A): Pure ethanoic acid is also known as glacial acetic acid.

Reason (R): Pure ethanoic acid often freezes during winter due to its low melting point of 290 K.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/4/1.

Hints

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

Hint 1

What does 'glacial' suggest?

Hint 2

Compare 290 K with winter temperatures.

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. The melting point of pure ethanoic acid is 290 K, so it freezes in cold weather into an ice-like solid. That is why it is called glacial acetic acid.

  2. Both statements are true and R explains A. Answer: option (A).

    1 mark

Answer: (A)

Where the marks are

  • Both true, R explains A, option (A) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Carbon and its Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/4/1: 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.