JEE Main 2022ChemistryChemical KineticsMediumNumerical

JEE Main 2022 — Chemical Kinetics Question with Solution

JEE Main 2022 (26 Jul Shift 1)

Question

For a reaction A→2B+C the half lives are 100 s and 50 s when the concentration of reactant A is 0.5 and 1.0 mol L= respectively. The order of the reaction is

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Correct answer
2

Step-by-step explanation

The relation between half-life and initial concentration of nth order reaction can be written as follows,

t12∝1A0n-1

100∝10.5n-1

50∝11n-1

21=10.5n-1

21=2n-1

n-1=1

n=2

order =2

For the second order reactions half-life is inversely proportional to initial concentration.

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About this question

This is a previous-year question from JEE Main 2022, 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.