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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumData or graph

JEE Main 4 April 2026, Shift 2, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?

The figure, in words

Graph of [R] (mol L^-1) on y-axis vs t/s on x-axis; all three curves start at [R]_0. Curve 1 falls almost linearly (slowest), curve 2 falls in a curve levelling off, curve 3 falls fastest and flattens near the axis.
  1. (1)The order of all the three reactions is same.
  2. (2)The rate constant of reaction 3 is larger than the rate constant of reaction 2 if order of reaction is same for both.Official answer
  3. (3)The SI unit of rate constant of reaction 1 is s−1\mathrm{s^{-1}}.
  4. (4)Thermal decomposition of HI on gold surface is an example of reaction 2.

Official answer

Option 2

NTA final key.

Chapter
Chemical Kinetics
Topic
Integrated Rate Equations
Idea tested
Kinetic Graphical Identification

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2021, Shift 1 · Q31For the following graphs, (a) Rate vs Time: horizontal line (b) t1/2t_{1/2} vs Initial concentration: straight line through origin with…MediumDiagram basedHas 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.