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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 3 August 2021, Shift 1, Chemistry Q51

Question 51 of 90 in this shift, Chemistry question 21 of 30, Section B.

Assuming H2\mathrm{H_2} is an ideal gas, consider the quantity “P.dd”, where ‘P’ is the pressure in atm and ‘dd’ is the density in g L−1\mathrm{L^{-1}}. For P = 8.21 atm, it is observed that (∂(Pd)∂P)T\left(\frac{\partial (Pd)}{\partial P}\right)_T = 10.0 g L−1\mathrm{L^{-1}}. The corresponding temperature in K is ________. (Nearest integer) [Assume R = 0.0821 L atm mol−1\mathrm{mol^{-1}} K−1\mathrm{K^{-1}}]

Official answer

40

NTA final key.

Chapter
States of Matter
Topic
Ideal Gas Laws
Idea tested
Gas Density and Molar Mass

Same idea in other shifts

Asked 3× in all
  1. 27 Jun 2022, Shift 2 · Q61Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas?EasyDiagram basedHas a figure
  2. 29 Jun 2022, Shift 1 · Q81Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL−10.46\ \mathrm{gL^{-1}} at…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 108 of the 174 JEE Main shifts held from 2017 to 2026.