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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 8 April 2023, Shift 1, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

Which of the following represent the Freundlich adsorption isotherms? A. [graph: xm\frac{x}{m} vs pp] B. [graph: log⁡xm\log\frac{x}{m} vs log⁡p\log p] C. [graph: xm\frac{x}{m} vs cc] D. [graph: xm\frac{x}{m} vs p1/np^{1/n}] Choose the correct answer from the options given below:

The figure, in words

Four graphs A-D. A: x/m (y) vs p (x), curve rising from origin and flattening (saturating). B: log(x/m) vs log p, straight line rising with a positive intercept on the y-axis labelled 'constant'. C: x/m vs c, straight line rising with a positive intercept labelled 'constant'. D: x/m vs p^(1/n), straight line rising from the origin.
  1. (1)A, B only
  2. (2)B, C, D only
  3. (3)A, B, D onlyOfficial answer
  4. (4)A, C, D only

Official answer

Option 3

NTA final key.

Chapter
Surface Chemistry
Topic
Adsorption
Idea tested
Freundlich Logarithmic Plot

Same idea in other shifts

Asked 7× in all
  1. 28 Jul 2022, Shift 2 · Q59Among the following the number of curves not in accordance with Freundlich adsorption isotherm is ________. (a) plot of log(x/m) (y-axis)…MediumNumerical valueHas a figure
  2. 27 Jun 2022, Shift 2 · Q89[figure: graph with vertical axis log⁡xm\log\frac{x}{m} (arrow pointing up) and horizontal axis log⁡p\log p (arrow pointing right); a straight…MediumNumerical valueHas a figure
  3. 3 Aug 2021, Shift 2 · Q58In an adsorption isotherm, it is seen that the graph of log⁡(xm)\log\left(\frac{x}{m}\right) vs log⁡P\log P, where PP is in atm, is a straight…MediumNumerical value
  4. 24 Feb 2021, Shift 1 · Q32In Freundlich adsorption isotherm, slope of AB line is :MediumDiagram basedHas a figure
  5. 2 Sep 2020, Shift 1 · Q48The mass of gas adsorbed, xx, per unit mass of adsorbate, mm, was measured at various pressures, pp. A graph between log⁡xm\log\frac{x}{m}…MediumNumerical value
  6. 6 Sep 2020, Shift 2 · Q49For Freundlich adsorption isotherm, a plot of log⁡(x/m)\log(x/m) (yy-axis) and log⁡p\log p (xx-axis) gives a straight line. The intercept and…MediumNumerical 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.