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Assertion (A) : It is not… (Class 12 Chemistry 2026, Q13)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/1/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2026: question 13

Set in the CBSE Class 12 board exam of 2026, paper 56/1/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedSolutions

Assertion (A) : It is not possible to separate the components of an azeotrope by fractional distillation.
Reason (R) : Components of an azeotrope have the same composition in liquid and vapour phase and boil at a constant temperature.

  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 56/1/1.

Hints

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

Hint 1

Fractional distillation depends on the vapour differing in composition from the liquid.

Hint 2

Is that true for an azeotrope?

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. An azeotrope boils at a constant temperature, and its vapour has the same composition as the liquid.

  2. Distillation therefore cannot enrich either component. Both A and R are true, and R explains A: option (A).

    1 mark

Answer: Option (A)

Where the marks are

  • Both statements are true and R explains A (1 mark)

Revise the chapter

  • Chapter: Solutions (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Solutions, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 56/1/1: 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.