JEE Main 2019ChemistryThermodynamics (C)HardMCQ

JEE Main 2019 — Thermodynamics (C) Question with Solution

JEE Main 2019 (10 Jan Shift 2)

Question

An ideal gas undergoes isothermal compression from 5 m3 to 1 m3 against a constant external pressure of 4 N m-2. The heat released in this process is 24 J mol-1K-1 and is used to increase the pressure of 1 mole of Al. The temperature of Al increases by:

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Show full solutionCorrect option: A
Correct answer
A23 K

Step-by-step explanation

Work done on isothermal irreversible compression for an ideal gas:

W=-4 1-5=16 J

For an isothermal process,∆U=0

q=-16J; heat released is 16 J.

q=nCmΔT

16=1×24×∆T

∆T=23 K

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About this question

This is a previous-year question from JEE Main 2019, covering the Thermodynamics (C) 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.