JEE Main 2023ChemistrySurface ChemistryEasyMCQ

JEE Main 2023 — Surface Chemistry Question with Solution

JEE Main 2023 (01 Feb Shift 1)

Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Amongst He, Ne, Ar and Kr; 1 g of activated charcoal adsorbs more of Kr.

Reason R: The critical volume Vc (cm3 mol–1) and critical pressure Pc (atm) is highest for Krypton but the compressibility factor at critical point Zc is lowest for Krypton.

In the light of the above statements, choose the correct answer from the options given below.

Choose an option

Show full solutionCorrect option: A
Correct answer
AA is true but R is false 

Step-by-step explanation

Kr has a maximum molecular weight, so it has more Van der Waal forces. So critical temperature is high and gas having more critical temperature is more adsorbed on activated charcoal. Hence, assertion is correct.

The critical volume and critical pressure is highest for krypton but the compressibility factor at critical point is lowest at krypton. This reason is incorrect because Zc=38 is same for all real gases.

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About this question

This is a previous-year question from JEE Main 2023, covering the Surface Chemistry 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.