JEE Main 2017PhysicsKinetic Theory of GasesEasyMCQ

JEE Main 2017 — Kinetic Theory of Gases Question with Solution

JEE Main 2017 (02 Apr)

Question

 The temperature of an open room of volume 30 m3 increases from 17°C to 27°C due to the sunshine. The atmospheric pressure in the room remains 1×105 Pa. If ni and nf are the number of molecules in the room before and after heating, then nf-ni will be:

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Show full solutionCorrect option: A
Correct answer
A-2.5×1025

Step-by-step explanation

Ti=273+17=290K

Tf=273+27=300K

From ideal gas equation, PV=nRT ⇒n=PVRT

nf-ni=PVR 1Tf-1Ti= -2.5×1025

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About this question

This is a previous-year question from JEE Main 2017, covering the Kinetic Theory of Gases chapter of Physics. 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.