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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 4 August 2021, Shift 1, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

Graph between log⁡xm\log\frac{x}{m}, ('x' is mass of gas adsorbed and 'm' is the mass of adsorbent) versus log P (P-pressure of gas adsorbed) is a straight line (as depicted in the figure). It is applicable when

The figure, in words

Graph with vertical axis labelled log x/m (with arrow) and horizontal axis labelled log P (with arrow); a horizontal dotted straight line is drawn at a constant height parallel to the log P axis, starting at the vertical axis.
  1. (1)Freundlich isotherm is not satisfied
  2. (2)Freundlich isotherm is satisfied with 1n=0\frac{1}{n} = 0Official answer
  3. (3)Freundlich isotherm is satisfied with 1n=∞\frac{1}{n} = \infty
  4. (4)Freundlich isotherm is satisfied with 1n=1\frac{1}{n} = 1.

Official answer

Option 2

NTA final key.

Chapter
Surface Chemistry
Topic
Adsorption
Idea tested
Limits of Freundlich Exponent (1/n)

Same idea in other shifts

Asked 2× in all
  1. 30 Jul 2022, Shift 2 · Q34Freundlich's adsorption isotherm (in terms of concentration) is given by the expression; xm=K⋅C1/n\frac{x}{m}=\mathrm{K}\cdot\mathrm{C}^{1/n}.…MediumOther

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.