JEE Main 2019ChemistryStates of MatterMediumMCQ

JEE Main 2019 — States of Matter Question with Solution

JEE Main 2019 (09 Apr Shift 1)

Question

Consider the van der Waal's constants, a and b, for the following gases.
Gas Ar Ne Kr Xe
a/(atm dm6 mol-2) 1.3 0.2 5.1 4.1
b/(10-2 dm3 mol-1) 3.2 1.7 1.0 5.0

Which gas is expected to have the highest critical temperature?

Choose an option

Show full solutionCorrect option: A
Correct answer
AKr

Step-by-step explanation

Critical temperature is :-

TC=8a27Rb
for Kr the value of ab is the highest so, Tc for Kr will be highest.
ab for Ar=1.33.2=0.406
ab for Ne=0.21.7=0.118
ab for Kr=5.11=5.1
ab for Xe=4.15=0.82

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About this question

This is a previous-year question from JEE Main 2019, covering the States of Matter chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.