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Friday, 9 October

JEE Main 2025 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 2 April 2025, Shift 1, Chemistry Q72

Question 72 of 75 in this shift, Chemistry question 22 of 25, Section B.

For the reaction A →\rightarrow products. The concentration of A at 10 minutes is ___________ ×10−3\times10^{-3} mol L−1\mathrm{L^{-1}} (nearest integer). The reaction was started with 2.5 mol L−1\mathrm{L^{-1}} of A.

The figure, in words

Graph of t_1/2 (min) on the y-axis versus [A]_0 / mol L^-1 on the x-axis: a straight line through the origin with slope = 76.92 (appropriate units).

Official answer

2435

NTA final key.

Chapter
Chemical Kinetics
Topic
Integrated Rate Equations
Idea tested
Zero Order Half-Life

Same idea in other shifts

Asked 2× in all
  1. 5 Apr 2026, Shift 2 · Q75For a reaction A→P\mathrm{A\to P} at T K, the half life (t1/2t_{1/2}) is plotted as a function of initial concentration [A]0[\mathrm{A}]_0 of A…EasyNumerical valueHas a figure

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.