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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedEasyDiagram reading

JEE Main 8 April 2023, Shift 2, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

The correct reaction profile diagram for a positive catalyst reaction.

The figure, in words

Four candidate energy vs reaction coordinate profiles, each comparing curves labelled 'Without catalyst' and 'With catalyst', with Reactant and Product levels marked
  1. (1)[figure: energy vs reaction coordinate; solid curve (without catalyst) with lower peak and dashed curve (with catalyst) with higher, shifted peak; products at different levels]
  2. (2)[figure: energy vs reaction coordinate; with-catalyst dashed curve has a slightly higher peak than the without-catalyst curve; same reactant and product levels]
  3. (3)[figure: energy vs reaction coordinate; with-catalyst dashed curve has a lower peak than the without-catalyst curve; same reactant and product levels]Official answer
  4. (4)[figure: energy vs reaction coordinate; with-catalyst dashed curve has a lower peak, shifted left, than the without-catalyst curve; product levels drawn differently]

Official answer

Option 3

NTA final key.

Chapter
Chemical Kinetics
Topic
Arrhenius Equation
Idea tested
Reaction Energy Profiles

Same idea in other shifts

Asked 4× in all
  1. 2 Apr 2025, Shift 2 · Q56Reactant A converts to product D through the given mechanism (with the net evolution of heat) : A→BA \rightarrow B slow; ΔH=+\Delta H = +ve…MediumDiagram basedHas a figure
  2. 6 Apr 2023, Shift 2 · Q63Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option Number of intermediates |…MediumDiagram basedHas a figure
  3. 31 Aug 2021, Shift 1 · Q53According to the following figure, the magnitude of the enthalpy change of the reaction A+B→M+N\mathrm{A+B\rightarrow M+N} in kJ mol−1^{-1} is…MediumNumerical 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 108 of the 174 JEE Main shifts held from 2017 to 2026.