Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 27 August 2021, Shift 1, Chemistry Q31

Question 31 of 90 in this shift, Chemistry question 1 of 30, Section A.

The unit of the van der Waals gas equation parameter ‘a’ in (P+an2V2)(V−nb)=nRT\left(\mathrm{P}+\frac{\mathrm{an^2}}{\mathrm{V^2}}\right)(\mathrm{V}-\mathrm{nb})=\mathrm{nRT} is :
  1. (1)kg m s−2\mathrm{kg\ m\ s^{-2}}
  2. (2)atm dm6 mol−2\mathrm{atm\ dm^6\ mol^{-2}}Official answer
  3. (3)dm3 mol−1\mathrm{dm^3\ mol^{-1}}
  4. (4)kg m s−1\mathrm{kg\ m\ s^{-1}}

Official answer

Option 2

NTA final key.

Chapter
States of Matter
Topic
Real Gases
Idea tested
Units of VdW Constants

Same idea in other shifts

Asked 2× in all
  1. 5 Apr 2024, Shift 2 · Q31What is the dimensional formula of ab−1ab^{-1} in the equation (P+aV2)(V−b)=RT\left(P+\frac{a}{V^2}\right)(V-b)=RT, where letters have their usual meaning.MediumSingle 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.