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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 11 April 2023, Shift 1, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

Thin layer chromatography of a mixture shows the following observation: The correct order of elution in the silica gel column chromatography is

The figure, in words

TLC plate with baseline near the bottom; spot B lies lowest (just above the baseline, centre), spot A upper left and spot C upper right, both at about the same higher height.
  1. (1)B, C, A
  2. (2)A, C, BOfficial answer
  3. (3)C, A, B
  4. (4)B, A, C

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Adsorption
Idea tested
Adsorption Chromatography Principle

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2022, Shift 2 · Q89The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and…EasyNumerical value

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.