JEE Main 2021ChemistryChemical KineticsMediumNumerical

JEE Main 2021 — Chemical Kinetics Question with Solution

JEE Main 2021 (22 Jul Shift 1)

Question

N2O5( g)→2NO2( g)+12O2( g)
In the above first order reaction the initial concentration of N2O5 is 2.40×10-2 mol L-1 at 318 K. The concentration of N2O5 after 1 hour was 1.60×10-2 mol L-1. The rate constant of the reaction at 318 K is        ×10-3 min-1 (Nearest integer):
[ Given :log3=0.477,log5=0.699]

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Show full solutionCorrect answer: 7
Correct answer
7

Step-by-step explanation

K=2.303tlogN2O50 N2O51
=2.30360log2.41.6=6.76×10-3 min-1≈7×10-3 min-1

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About this question

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