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Low concentration of oxygen… (Class 12 Chemistry 2023, Q2)

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

CBSE Class 12 Chemistry 2023: question 2

Set in the CBSE Class 12 board exam of 2023, paper 56/1/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQSolutions

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to :

  1. (A)high atmospheric pressure
  2. (B)low temperature
  3. (C)low atmospheric pressure
  4. (D)both low temperature and high atmospheric pressure

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

Think of Henry's law.

Hint 2

How does air pressure change as you go up a mountain?

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. By Henry's law, gas solubility is proportional to its partial pressure, .

  2. At high altitude the atmospheric pressure, and so the partial pressure of , is low. Less oxygen dissolves in blood (anoxia). Option (C).

    1 mark

Answer: Low atmospheric pressure, option (C)

Where the marks are

  • Links low O2 solubility to low 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.