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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 25 July 2021, Shift 1, Chemistry Q31

Question 31 of 90 in this shift, Chemistry question 1 of 30, Section A.

For the following graphs, (a) Rate vs Time: horizontal line (b) t1/2t_{1/2} vs Initial concentration: straight line through origin with positive slope (c) Concentration vs Time: decaying curve (d) Concentration vs Time: horizontal line (e) Rate vs Concentration: straight line through origin with positive slope Choose from the options given below, the correct one regarding order of reaction is :

The figure, in words

Five small graphs: (a) Rate vs Time, horizontal line; (b) t1/2 vs Initial concentration, straight line rising from origin; (c) Concentration vs Time, curve decaying (starting high, falling steeply toward a low flat tail); (d) Concentration vs Time, horizontal line; (e) Rate vs Concentration, straight line rising from origin.
  1. (1)(a) and (b) Zero order (c) and (e) First orderOfficial answer
  2. (2)(a) and (b) Zero order (e) First order
  3. (3)(b) Zero order (c) and (e) First order
  4. (4)(b) and (d) Zero order (e) First order

Official answer

Option 1

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. 4 Apr 2026, Shift 2 · Q63Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical…MediumSingle correctHas 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.