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Saturday, 31 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 7× in all
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  6. 3 Sep 2020, Shift 2 · Q31A mixture of one mole each of H2\mathrm{H_2}, He and O2\mathrm{O_2} each are enclosed in a cylinder of volume V at temperature T. If the…EasySingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.