JEE Main 2024ChemistryChemical KineticsHardNumerical

JEE Main 2024 — Chemical Kinetics Question with Solution

JEE Main 2024 (01 Feb Shift 2)

Question

The following data were obtained during the first order thermal decomposition of a gas A at constant volume:

Ag→2 Bg+Cg

S. No                 Time/s                 Total pressure/(atm)

 1.                        0                        0.1

 2.                      115                     0.28

The rate constant of the reaction is _______ ×10-2s-1 (nearest integer)

Enter your answer

Show full solutionCorrect answer: 2
Correct answer
2

Step-by-step explanation

t=0t=115 sec. Ag0.10.1-x →2Bg2x+Cg2x

0.1+2x = 0.28

2x=0.18

x=0.09

K=1115ln0.10.1-0.09

=0.0200sec-1

=2×10-2sec-1

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About this question

This is a previous-year question from JEE Main 2024, covering the Chemical Kinetics 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.