JEE Main 2021ChemistryStates of MatterMediumNumerical

JEE Main 2021 — States of Matter Question with Solution

JEE Main 2021 (01 Sep Shift 2)

Question

An empty LPG cylinder weighs 14.8 kg. When full, it weighs 29.0 kg and shows a pressure of 3.47 atm. In the course of use at ambient temperature, the mass of the cylinder is reduced to 23.0 kg. The final pressure inside the cylinder is _____ atm. (Nearest integer)

(Assume LPG to be an ideal gas)

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Show full solutionCorrect answer: 2
Correct answer
2

Step-by-step explanation

Initial mass of gas =29-14.8=14.2Kg

mass of gas used : =29-23=6Kg

gas left =14.2-6=8.2Kg

(1) 3.47×V=14.2×103M×R×T

(2) p×V=8.2×103M×R×T

Divide : (1)/(2)⇒  3.47P=14.28.2

P=2.003

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About this question

This is a previous-year question from JEE Main 2021, 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.