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The colligative property… (Class 12 Chemistry 2023, Q1)

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ChemistryCBSE Class 12 · Board exam 2023, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2023: question 1

Set in the CBSE Class 12 board exam of 2023, paper 56/1/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQSolutions

The colligative property used for the determination of molar mass of polymers and proteins is :

  1. (A)Osmotic pressure
  2. (B)Depression in freezing point
  3. (C)Relative lowering in vapour pressure
  4. (D)Elevation is boiling point

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 56/1/1.

Hints

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

Hint 1

Which colligative property gives a large, easily measured value even for dilute solutions?

Hint 2

Proteins break down on heating, so avoid methods that need boiling or freezing.

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. Polymers and proteins have very high molar masses, so their solutions give tiny , and vapour-pressure lowering, but a measurable osmotic pressure.

  2. Osmotic pressure is measured at room temperature, so heat-sensitive biomolecules are not damaged. Answer: osmotic pressure, option (A).

    1 mark

Answer: Osmotic pressure, option (A)

Where the marks are

  • Chooses osmotic pressure (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 paper2023 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.