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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedEasyData or graph

JEE Main 5 September 2020, Shift 1, Chemistry Q42

Question 42 of 75 in this shift, Chemistry question 17 of 25.

The potential energy curve for the H2\mathrm{H_2} molecule as a function of internuclear distance is :

The figure, in words

Four graphs, each with axes labelled Energy (vertical, arrow pointing up) and Internuclear distance (horizontal, arrow pointing right), no numerical scale; see option text for the curve shapes.
  1. (1)[graph] Energy (vertical axis, arrow up) versus Internuclear distance (horizontal axis, arrow right): curve falling from high energy at small distance and flattening out at large distance, no minimum
  2. (2)[graph] Energy versus Internuclear distance: curve rising from low energy at small distance and flattening out at large distance
  3. (3)[graph] Energy versus Internuclear distance: curve falling from high energy to a minimum and then rising and levelling off at larger distanceOfficial answer
  4. (4)[graph] Energy versus Internuclear distance: curve rising to a maximum and then falling at larger distance

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Chemical Bonding and Molecular Structure
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.