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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 February 2021, Shift 1, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

Using the provided information in the following paper chromatogram : Fig : Paper chromatography for compounds A and B. the calculated Rf\mathrm{R_f} value of A ________ ×10−1\times10^{-1}.

The figure, in words

A vertical rectangle of paper. Dotted line near the top labelled 'Solvent front'; dotted line near the bottom labelled 'Base line', with a dot on it labelled 'Spot'. Two dots inside the rectangle: B above, A below it. A double-headed arrow labelled 5 cm on the left spans from the base line up to the solvent front. On the right, two stacked double-headed arrows each labelled 2 cm: the lower from the base line to A, the upper from A to B.

Official answer

4

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
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.