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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 7 April 2025, Shift 1, Chemistry Q51

Question 51 of 75 in this shift, Chemistry question 1 of 25, Section A.

At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total pressure is 1.15 atm, then calculate the ratio of following respectively: (i) partial pressure of nitrogen gas to partial pressure of oxygen gas (ii) partial pressure of oxygen gas to partial pressure of argon gas (Given: Molar mass of N, O and Ar are 14, 16 and 40 g mol−1\mathrm{mol^{-1}} respectively.)
  1. (1)2.59,11.852.59, 11.85
  2. (2)2.96,11.22.96, 11.2Official answer
  3. (3)4.26,19.34.26, 19.3
  4. (4)5.46,17.85.46, 17.8

Official answer

Option 2

NTA final key.

Chapter
Some Basic Concepts of Chemistry
Topic
Ideal Gas Laws
Idea tested
Dalton's Law

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2022, Shift 1 · Q83The pressure of a moist gas at 27∘27^\circC is 44 atm. The volume of the container is doubled at the same temperature. The new pressure of…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.