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JEE Main 4 August 2021, Shift 2, Chemistry Q52

Question 52 of 90 in this shift, Chemistry question 22 of 30, Section B.

A gaseous mixture of helium and oxygen contains 20% helium by weight. If the partial pressure of oxygen in the mixture is 5 atm, the partial pressure of helium is ________ atm. (Nearest integer) [Atomic Masses : He : 4.0 u; O : 16.0 u]

Official answer

NTA final key.

Chapter: Thermodynamics (Chemistry)
Topic: Ideal Gas Laws
Idea tested: Dalton's Law

Same idea in other shifts

Asked 7× in all

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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.