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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 4 September 2020, Shift 1, Chemistry Q30

Question 30 of 75 in this shift, Chemistry question 5 of 25.

The intermolecular potential energy for the molecules A, B, C and D given below suggests that :

The figure, in words

Graph of Potential Energy (kJ mol^-1, y-axis from 0 down to -600 in steps of 100) against Interatomic distance (pm, x-axis marked 50, 100, 150). Four curves each with one minimum, labelled A-A, A-B, A-C and A-D, each label printed just below its own curve's minimum (no legend box) (A-A and A-B dashed, A-C dotted with filled dots, A-D with crosses). Minimum depths and positions are read approximately from the drawing and are not printed.
  1. (1)A–A has the largest bond enthalpy.
  2. (2)A–B has the stiffest bond.Official answer
  3. (3)A–D has the shortest bond length.
  4. (4)D is more electronegative than other atoms.

Official answer

Option 2

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.