JEE Main 2023ChemistryChemical KineticsMediumNumerical

JEE Main 2023 — Chemical Kinetics Question with Solution

JEE Main 2023 (30 Jan Shift 1)

Question

If compound A reacts with B following first order kinetics with rate constant 2.011×10-3 s-1. The time taken by A (in seconds) to reduce from 7 g to 2 g will be _____ . (Nearest Integer) log5=0.698,log7=0.845,log2=0.301

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Show full solutionCorrect answer: 623
Correct answer
623

Step-by-step explanation

Given,
  A+B→Pt=0 7gt=t 2g

at constant volume

From formula of first order kinetics:
⇒t=2.303 KlogA0At

=2·3032·011×10-3log72

=2·303×0.5442·011×10-3

=622.989

≈623

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About this question

This is a previous-year question from JEE Main 2023, 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.