JEE Main 2026 — Chemical Kinetics Question with Solution
JEE Main 2026 (05 April Shift 1)
Question
If the half life of a first order reaction is minutes then the time required for completion of % of the reaction will be _____ minutes.
(Given : )
(Given : )
Enter your answer
Show full solutionCorrect answer: 46.06
Correct answer
46.06
Step-by-step explanation
For a first-order reaction, the rate constant is given by:
Using the standard approximation :
The time required for completion of the reaction is given by the integrated rate law:
Here, the initial concentration and the amount reacted , so .
Answer:
Using the standard approximation :
The time required for completion of the reaction is given by the integrated rate law:
Here, the initial concentration and the amount reacted , so .
Answer:
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This is a previous-year question from JEE Main 2026, 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.