JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 4 April 2026, Shift 2, Chemistry Q74

Question 74 of 75 in this shift, Chemistry question 24 of 25, Section B.

For a first order reaction

\mathrm{A\rightarrow B}

[table: t/min = 0, x, 20; [A]/M = 0.6500, 0.0650, 0.00065]

x=

________ min. (Nearest integer)

Official answer

NTA final key.

Chapter: Chemical Kinetics
Topic: Integrated Rate Equations
Idea tested: First Order Integrated Rate Law

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Asked 5× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.