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Which of the following… (Class 12 Chemistry 2025, Q2)

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ChemistryCBSE Class 12 · Board exam 2025, set 56/7/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2025: question 2

Set in the CBSE Class 12 board exam of 2025, paper 56/7/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQSolutions

Which of the following solutions will have the highest boiling point in water ?

  1. (A)1% KCl
  2. (B)1% glucose
  3. (C)1% urea
  4. (D)1%

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 56/7/1.

Hints

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

Hint 1

Elevation in boiling point is a colligative property.

Hint 2

For equal mass percentages, compare i divided by molar mass.

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. . For 1% solutions, the number of particles is proportional to .

  2. The values of are: KCl ; glucose ; urea ; . gives slightly more particles (0.0270 vs 0.0268), so it has the highest boiling point.

    1 mark

Answer: (D) 1%

Where the marks are

  • Compares and chooses (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Solutions, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 56/7/1: 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.